What's the BEST POOL SHOCK for Your Pool? | Swim University

What is pool shock and what does it mean to “shock” a pool? "Shocking” is the process of adding a powerful, concentrated dose of chlorine or oxidizer to your pool water. But there are lots of types of shock on the market. So here’s everything you need to know about finding and using the right shock in your pool.
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⏰ Timestamps:
00:00 - Introduction to the Right Pool Shock
01:06 - What Does Shock Do to a Pool?
01:46 - What Are the Different Types of Pool Shock?
02:19 - What's the Best Type of Shock for Your Pool?
02:45 - #1. Cal-Hypo Shock
03:34 - #2. Dichlor Shock
04:15 - #3. Non-Chlorine Shock or Oxidizer
04:45 - What Kind of Shock is Best for Algae?
05:12 - What Kind of Shock is Best for Saltwater Pools?
05:54 - What Kind of Shock is Best for Smaller Pools?
06:22 - When Should You Add Shock?
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Swim University has made swimming pool and hot tub care easy for more than 10 million homeowners. And each year, we continue to help more people with water chemistry, cleaning, and troubleshooting. We know taking care of a swimming pool or spa can be difficult. And it’s hard to find a trusted source of information. We get it! This is the reason we created Swim University.
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[@SwimUniversity]

We hope this helps you understand pool shock! If you need more help with pool maintance, be sure to grab the free Pool Care Cheat Sheet at www.swimuniversity.com/cheatsheet 👍

[@brandonj.9638]

Does potassium monopersulfate destroy current combine chlorine? Or only prevent the formation of new chloramines? I have searched the web and have found mixed results. Also, I use the Taylor titrations to test my fc and combined chlorine levels and was planning on weekly using non chlorine shock to shock my pool. However, from what I've read, people say that potassium monopersulfate affects the titration test for combined chorine. Is this true? If so, how would I test my combined chlorine if using non chlorine shock? I prefer to use non chlorine shock since after using chlorine shock it took two days for my chlorine to go back to safe levels, and that is too many days wasted not swimming on a weekly basis. Thanks in advance.

[@brandonj.9638]

Please answer my above question when you have time. Thanks. 😁

[@stephenl2571]

Pool shock is what I add when i have no idea what’s wrong with the pool

[@alexzandrea2010]

Same lol

[@SoulOfRussia]

This made me lol 🤣

[@stephenl2571]

@@SoulOfRussia sorry I don’t speak orc

[@SpreadAU]

What’s ORC?

[@vaughnwhyte457]

Me too lol

[@raypatalano9093]

excellent job on these videos - thank you!

[@stevebugg9568]

Well done. I like the way you simplify the issues.

[@ajacowart7795]

Your videos are the best!! Thank you thank you

[@johncornali]

Great information!!!

[@user-zc8zx6jl5g]

Going back 37 years, the only SHOCK I used was (SodiumDichlorIisocyunurate)Sodium DiChlor, and the only Hot Water Treatment for Spa Pools, other than Bromine in Australia. It was back then 65% chlorin, had a good pH of 6.5, and was effective to 28° Celsius. I find it it still an effective Sanitiser today, yes it's Stabilised, but given certain environment conditions, it is truly a Wonderful treatment.

[@corazontaylor3664]

Hello, from the Philippines here, just want to asked do I need to put dry acid and when to used it. Many thanks

[@ChatGPT-xm7xs]

Use quadchlor - it has all the advantages of calhypo, trichlor and dichlor. Can be used on pools as little as 50,000 gallons.

[@spikeybabies]

If I have a problematic pool that always gets algae: Obviously this is assuming you’re a pool guy/gal whose adding a gallon, or moreOf chlorine to the pool on your weekly service visit. 1) usually it’s time to clean the filter 2) put a pool Rx plus in the pump after cleaning the filter (this is why having a sand filter with vitro clean is truly the way to go) 3) raise Borates to 50 PPM (balance PH and alkalinity immediately after adding) If this still hasn’t worked 4) check phosphates and add some phosphate remover This has been pretty effective so far.. If the pool is still getting really bad algae it should become salt pool and if the pool Is covered it should have an ORP system. Remember to also check Total Dissolved solids obviously if it’s above 2,700 - 3,000PPM you have to drain the pool a minimum of halfway down. Remember if you’re using a Lamotte tracer to check TDS and Salt level you need to subtract the salt level from the TDS reading to have an accurate TDS reading. If you’re still reading this right now and you want a job I have a full route ready for you on the peninsula Bay Area california. Reply to this. And we can talk more.

[@kenblaies5538]

I have a in ground saltwater pool in Ohio. What kind of chlorine should I add and when? Opening in May

[@juanrojas6596]

Can you add chlorine granuel's for shock

[@bigal1337]

Salt pool is the best! Salt, phosphate free, Leslie’s clear, three ingredients and at times calcium etc. can’t remember last time I brushed the pool. Easiest thing ever to take care of!

[@SwimUniversity]

We're coming out with a salt water pool video next! Lots of folks switching over :-)

[@mwachner]

@@SwimUniversity we did last summer 2021 - love it - but right now (May 2022) I can’t get get my PH below 8 - I’ve added 1.5 gals of acid in last 2 weeks and it is still 8.1 ish - any suggestions?

[@SwimUniversity]

@@mwachner Check your run times on your salt water generator. That's where the high pH comes from. And it should be set around 8 hours. Also check your CYA levels, which should be on the higher side for a salt water pool (80 ppm+). If your CYA levels are high enough, the chlorine sticks around longer. And that means the system has to run less and the pH doesn't kick up as much.

[@MrGabemoore33]

I have 22x52 intex saltwater pool ,what is best weekly shock to add to just keep clear?

[@AM2PMReviews]

Why don't they make unstablized tablets? I found that using trichlor tabs always works but the CYA levels are always going up so maybe there is a better way to have slow release without the CYA additive?

[@tstanley01]

You can get cal hypo tabs as well, but they are more rare. Just use liquid chlorine...it doesn't add calcium or CYA, just salt.

[@yonnicascales56]

Should you dissolve pool shock before adding

[@ShortyTica87]

I have a BestWay pool for first and I haven’t get in the water.. now my pool turned green, what should I do? Mine are 48ft.. use chroline pills or shock power??

[@mikee3997]

Thank you and what shock recommend that’s discolves quick and does not fall to t bottom of pool

[@SwimUniversity]

Sodium dichlor dissolves quickest of the chlorine shocks. Oxidizer/non-chlorine shock dissolves fast, too.

[@rudianger123]

@Swim University --- have you ever done a review of Pentair "ChemCheck Water Quality Monitoring System"? Dying to know if its worth it. Thx!

[@SwimUniversity]

We haven't reviewed it

[@Tleal-vy5bt]

How much liquid shock or bleach do I use for 1000 gallon above ground pool

[@preyforcougars3601]

Question: why differentiate non-chlorine pool shock from chlorine as an “oxidizer” if chlorine *is also an oxidizer* ? Isn’t that literally how chlorine works is by oxidizing contaminants? Or am I missing something? (Not trying to be rude, genuinely curious)

[@firstsite9538]

Awesome video. I have a high combined available chlorine problem. I've been having this problem for a year. I keep on adding chlorine but doesn't show to have any free chlorine. My pool is 12,500 gallons it's blue water but cloudy my cya is 42 my pH is 7.4 my free chlorine is .23 and my total chlorine is .65 how many pounds of oxidizer do I need to put in the pool and how long after I apply The oxidizer into the pool I need to pour chlorine. Also how many pounds of chlorine do I need to apply

[@CoolMooseTV]

Definitely try bringing your cya up with conditioner

[@shaunawiebe4857]

I would like to know how much bleach I should use for shocking my pool. We have an above ground pool we are setting up. Can I use bleach instead of chlorine?

[@jaz1844]

How much liquid chlorine in cups do I add to a 1100 gallon Inter pool thT is light green 🤢 …..all the dip sticks I take once a week always come out in good numbers but we had bad heavy on off rain for a few days could the rain water really mess up my pool water that bad.???

[@jmello1798]

Unfortunately i found a deceased possum at the bottom of my 25,000 gal pool. I removed it and shocked the pool that evening with 2lbs of granular shock Do you have any suggestions as to what else I should do to make the water swim safe? Thank you

[@TomWilson8003]

Do you need to mix the cal hypo shock in a pail of water or can you just pour the powder directly into the pool.? Do you premix it to make sure its dissolved? Is powder better than liquid shock?

[@SwimUniversity]

Pre-mixing in water is required for cal-hypo shock. But always follow the manufaturers directions! Cal-hypo shock comes in granules/powder, not liquid.

[@dudleydooright]

You didn't mention my favorite of all.. and the advantages of using it: Liquid Chlorine

[@victoriaknowles4168]

I just add a few cups of liquid pool Chlorine everyday. I haven’t had to use shock. I use a Taylor K 2006 kit. I haven’t had any issues. And it saves me a ton of money.

[@SwimUniversity]

Awesome! Just a few cups? What size pool do you have?

[@aslater]

Does this impact your ph? I am thinking about making the move to liquid chlorine

[@victoriaknowles4168]

@@aslater nope…my pools seems to rest at a PH of 7.4. I use muriatic acid to lower if I need too. But that’s rare. Backing soda to raise.

[@victoriaknowles4168]

@@SwimUniversity 2-3 cups daily…depends if we have a heavy swim load. My Cya is at 40ppm…so I like to keep my free chlorine at 7ppm. We have a 15,000 gallon pool. It has stayed Chrystal clear.

[@rvb880]

@@victoriaknowles4168 i have about the same size pool and thinking about switching to just using chlorine my cya jump up to over 110 ppm using the 3 inch tabs and shock Do you use the tabs at all or just the liquid chlorine ?

[@shanikajohnson2078]

Hello, thanks for all this.. I have a 22x 53 size pool I think its about 30,000 if not more gallons I can use the Cal hypo chol shock correct for this above ground pool?

[@nickcampbell1887]

What about a product like Remington Solar’s chlorine-free sun shock pool purifier that uses copper anodes connected to a solar panel that just floats in the pool all the time? There’s not much information out there about these, but people seem to love them and claim that it reduces the amount of other chemicals needed.

[@SwimUniversity]

Looks like an ionizer but not necessarily "shock" like we're talking about here. Might be good for maintenance but if you run into a major pool problem like algae, shocking is usually required

[@StephRenee812]

Idk our first year with pool. And from day one we finally was told kids were in our pool every night. Our pool has been a mess we couldn't figure out what was going on. Cloudy and green and slim all over. I was getting in every day and scrubbing and my hubby was shocking and taking to pool place. And I have stayed up last 2 nights to catch these kids. Not good living right next to a playground. We found out the 3 kids down street were in it. We found mud all kver where they must had been in and out. We have a locked ladder they were jumping over and in. I got my bb gun ready for now. 🤣 we are new to this pool thing. Hoping my hubby will watch and learn as well. Because I want a nice clear pool..

[@cwsosby]

Haha, that is funny. I like the BB gun idea as well. You can watch all the videos you want, and it will help. But trial and error is where you will learn the rules.

[@len9483]

Just buy a Rottweiler.

[@martirobertson4291]

We have an Coleman/Bestway 12' x 26' oval above ground pool which is about 7,500 gallons. Is it ok to use Cal-Hypo shock in our pool, even though it's normally for 10,000 gallons?

[@juanabernathy5371]

Are you sure that's the right amount of gallons of water it holds. I have a 16x42 that holds about 5,000 gallons of water. I use cal-hypo, but only half a bag. It's strong stuff. I mix it with water first in a bucket and pour it around the pool so it spreads evenly.

[@patriotjedimaster1450]

I just had my pool installed. 10,000 gallon semi inground. I’m putting in a mineral ionizer to handle algae. Can I survive just using a weekly oxidizer? I’m trying to keep my pool completely chlorine free, if possible. Thanks! Great videos… I can’t stop watching! lol

[@harley5881]

Maybe look into Ozone sanitization of your pool water. Can be a good (gentle on skin) chlorine alternative in some circumstances.

[@SwimUniversity]

We have an article about this: www.swimuniversity.com/chlorine-free-pool/ A weekly oxidizer won't be enough. You'll need a system in place like an ozone system or you can use Bromine or Baquacil.

[@gonzogear]

Question: we have a 13,000 gallon pool. I'm confused about the 3 shocks mentioned in this video. I like to use liquid pool chlorine to balance my chlorine levels to 1-3 ppm. Does this mean that I can shock my pool with the same liquid chlorine, but just use more to get the levels above 3ppm? If so, what ppm level am I looking for to shock my pool weekly? Thanks.

[@SwimUniversity]

You'll want to reach 10 ppm to remove algae, bacteria and chloramines. That would be "shocking." The rest of the time you're just keeping the chlorine balanced. If your combined chlorine levels are low and your free chlorine levels are 1-3 PPM, you probably don't need to shock weekly.

[@Aviyapoptarts3451]

Our water is clear but we have two green stains in our above the ground pool. What solution can be used to remove those stains? Thank you.

[@seanstrickland4970]

Scrub it with a chlorine tablet. Use gloves

[@justinknight1209]

I have a Intex above ground pool that is circular, 15ft from one side to the other and 48in deep. I bought mine online from Amazon because I knew nothing about buying pools and how different times of year effect availability and price and I had no idea that our local Walmart and other stores that sell these kind of pools start selling them around February when it's still cold I ended up going to try and find a pool when it was too late and the local Walmart and other stores had already been done sold their pools cause they sell them so early in the year around Feb and here it was like April or May when I was trying to find one with absolutely no luck at all so I ended up having to try and find one on Amazon and I found one from a reliable source but because it was so late into the year and pool demand was at its highest and pool availability was at its lowest I ended up paying way way way more for my pool than it normally costs. I ended up paying $1,000 for my intex 15ft by 48in pool because it was the absolute last one the Amazon seller had in stocks and almost all other Amazon sellers were sold out as well or charging the same or more price for what they had but because I wanted one extremely bad and had the money at the time and knew Walmart nor any other stores around would have anymore until the next year when they started selling pool stuff again I gave in and paid way more for the pool. I thought that I text pools had their own chemicals that you could buy at places that sold intex pools like Walmart but once I bought mine I found out that's not true or atleast not always the case atleast depending what type of intex pool, what chemicals are needed and what stores sell em in the area. I found out that Walmart here sold the pools and the filters for the pumps when they had them and were not sold out but that they don't sell chemicals really although you might find a small bag of shock or chlorine but deff not everything you need or in enough supply to last you all summer and that most of them tell you to go to your local pool store for the chemicals you need wich I ended up doing and here we only have 1 local pool store that only really deals with inground pools and the big above ground pools you buy from pool stores and have them come and install that are not the same as intex pools although they may look similar. But at the pool store my first time the lady that was there was nice and told me that although what they have is really for ingroubd pools or big above ground pools and not really for intex pools that she would try to get me stuff she thought would be best and help me best she could and so I ended up buying a chlorine tab floater wich floats in the pool and hold a chlorine tab and ended up buying a bucket of chlorine tabs or pucks and a bucket of shock, o e was $100 and the other was about $200 and at the time they only had like 3 buckets of shock left and she told me that I would absolutely need one and that those 3 buckets were all they had left and that they would probly not be getting anymore till the next year because of how pool stuff works with demand and availabilityand she told me that this three buckets would almost for sure be gone by the end of the day so I went ahead and got one and she was right cause when I went back in the next day the raining buckets of shock were gone so I was glad i bought mine before they sold out. Once I filled my pool and shocked the water and added a chlorine tab I would take samples of my wTer back to the pool place and they would test it for me and help me if I needed something to help make my pool water right but one time I went in and it was the store owner I think that I ended up getting and he seemed like he wanted to try and tell me how I should buy a big above ground pool from a pool store instead more than anything and tell me how the big above ground pools that pool stores sell are better and how I'd be spending about the same amount of money or less in the long run and so on and so on. But anyway the shock they gave me was hypo chlorine shock or whatever but what I do is take a bucket and scoop out some of my pool water then add a scoop of shock into the bucket and stir and let sit till its almost completely dissolved and don't have a bunch of granules at the bottom and then walk around the pool as I pour it in. the only issue I've had with my pool is that I think the pump that came with it isn't big enough because last yearthere were times the pool didn't get swam in by people every day to stir the wTer up alot and at one time it started to turn green but that was also during the hottest part of the summer and the pool place informed me that because my pool sits in the sun that I should shock twice a week because alot of the chlorine was probly being evaporated out due to the sun and how hot it gets here. But we ended up adding 2nd smaller pump from a smaller kids intex pool someone gave us to help when the water wasn't getting g stirred up as much at times people didn't swim in it at much and after that we had no problems so far this is my 2nd summer and I took mine down during the winter and when putting it up this year I notices a small tear in the liner and I'll say flex seal spray has fixed any small holes great so far but the area has to be dry when you spray it and has to stay dry till the flex seal spray dries then you can add water.

[@I4got]

Years ago I had a retired pool man show me that I didn't need all of the so called pool products that cost way to much for most people.... He asked if I had household bleach, baking soda, and borax... I did... He commenced to tell me how to play with it, till I got it figured out what I needed for the size of pool I had... That lesson was cheap, and better learnt from anyone.... Never had a problem with any algae...

[@StephRenee812]

@@I4got I just asked this right before I read this. We have our first pool and I figured there had to be cheaper ways. I am all about diy. And saving money. My husband isn't quite on board yet. But if he would just try I mean it isn't going to hurt anything now. Kids have. Even in our pool in middle of night since we put the dang thing up. I kind of thought something was going on. But hubby said I was paranoid.well we find out. Every night.. I tried to stay awake to scare the crap put of them just didn't happen but my buddy next door scared um. 2 groups of kids the last were drunk and took off and they had to carry the one girl.. our pool has been nasty now we know why. Green we get it gone slim we get it gone then back again now I've been staying up and we are struggling to get it back to clear. A lot of money hubby keeps going to pool store and I told him don't they just want to sell you their product.. 200 last trip and that ain't even the 2 times before. So I'm ready to do it myself. Help

[@StephRenee812]

@@I4got what size pool and what was your routine?

[@I4got]

@@StephRenee812 I'm sorry to hear about your dealings with people like that... I've had different sizes over my lifetime... The one I had when I learned the tricks was a 32,000 gallon inground... Look at the exact chemical on each product that your husband bought, then go look at the main chemical in those 3 things that I mentioned... Baking Soda is to raise your ph balance Borax is to balance the ph, alkalinity, and help bleach to kill everything... Just remember that the sun eats away the chemical in the bleach... Also, please tell your husband to go buy a cheap game camera, and put it up somewhere directing to the pool to get pictures of those people for you both to have proof when it is needed....

[@I4got]

@@StephRenee812 The Borax will make the water crystal clear, and soft pretty quick... The measurement that I use is around 20 ounces of Borax in 10,000 gallons once a week... So if your pool is smaller, or larger try to use that math... I have an old container with a lid, and handle that I use... I put water (from the pool) in the bottom, then add Borax to it shake, (fill the rest of the way up) then pour out into the pool as I walk around... Just keep adding, shaking, and pour until you get all the ounces that you need in your pool... (Like to take the last little bit of Borax and slowly pour into the skimmer to go directly to the sand...) I do the same mixing, and pouring for the Baking Soda.... The Borax mix will be warm when you shake it, versus the Baking Soda will be cold... If you have a plant watering bucket already just use that, and mix with your hand, or a utensil of some kind...

[@Dominika-yn9fd]

If there is no algae problem then what about using non-chlorine shock in saltwater pool? It will not raise your calcium or CYA levels. Is that a good option or is it better to super chlorinate?

[@JumbledPage]

It’s a great option if you heavily use your pool and if it’s within your budget. It will keep the chlorine fresh working to maximum efficiency as long as PH is within range. Make sure you’re consistently putting acid into your pool the salt in the water raises the PH. Try not to super chlorinating too often, as you’re wasting your salt cell out faster. Try to maintain the amount of chlorine at 3ppm adjusting. and then shock with dichlor (not cal hypo) whenever you want to increase the chlorine it’ll allow the cell to last longer

[@yayalu5140]

Is there a way to protect water before rain? If it rains let's say two consecutive days?

[@SwimUniversity]

You can alwasy bump up the chlorine levels a bit. But your best bet is just to keep it protected from debris and adjust your levels afterwards.

[@StephRenee812]

I didn't realize also how expensive this was to have a pool. Isn't there ways to make some of the stuff to treat yoir pool? Or should I get that let's save money and make our own out of my head.

[@ThePegquinney]

When I shock my pool can I leave the floating chloranator in with the tab in it or take it out ??

[@len9483]

You can leave it in.

[@TheXerosyn]

I just opened my pool up for the first time. I have chlorine tabs in the floater. I know I need to start adding chemicals to it, should I do it one chemical at a time, wait for the levels to be correct then move on to next. Or can I do all at once? What is the best way thank you

[@SwimUniversity]

We just posted a video answering this question! kzbin.info/www/bejne/l2SVgZZjobx3hKs

[@traceylynn1710]

If I have to add a lot of well water which can be heavy in iron & minerals after opening my pool, is there something I should add to counteract the metals in the well water?

[@mwachner]

I have the same problem

[@SwimUniversity]

We highly recommend filtering your water before it gets into your pool by using a hose filter that screws on the end of your garden hose. Otherwise you'll need to use a metal sequestrant after you fill.

[@jeffoprondek5506]

A product called CuLator helped me remove high metal levels in my pool a few years back. You might need to add a sequestrant first before using CuLator though

[@traceylynn1710]

@@jeffoprondek5506 I noticed in the past if there’s a lot of well water then I shock it it turns brown like coffee.

[@adwinmaldonado345]

Use white cotton socks sounds crazy but it works

[@benjamindavidson632]

I have some questions. A month or so old video so I'll hold back for now. But if you respond the questions fly hahaha

[@patriciasciscione8853]

Should I shut off the automatic chlorinator when I shock the pool or leave it on? Thank you.

[@chandyj.2655]

I was wondering the same

[@omgbygollywow]

Our pool shows 10 PPM, but we have a green pool. So, the pool store wants us to shock by putting in more Suncoast Gold liquid Chlorine. That doesn't make sense to me. We have high chlorine and yet they want us to put more chlorine?!?!?!

[@vVvCuhRazy]

I just bought our first pool. It’s 18’ and 48” deep. I have to get my alkalinity and ph right first but idk what type of shock to use. Do you just suggest bleach since it’s a smaller pool ?

[@Izzy74803]

I have the same size pool. Used dry acid to lower alkalinity....it's less harsher/dangerous than muratic acid.

[@SwimUniversity]

How is your pool water looking? And how many gallons does it hold? Sounds like it might be the same-ish size as the green pool in the beginning of the video? If you have an algae problem, you should use a chlorine-based shock like cal-hypo.

[@joshsansone5113]

I have the same size pool. Upgraded to the 12" Intex sand filter. I use (2) of the three inch 99% trichlor pucks always and 60-80oz of liquid pool chlorine weekly. Pump runs 10hrs a day changing the water roughly twice daily. Pool stays clear. My pH stays fairly consistent. To lower you can use muriatic acid and to raise you can use baking soda.

[@vVvCuhRazy]

@@SwimUniversity No it was a fresh fill. I got ALK and PH good and using 3" tabs currently. Still debating what shock to use. I have chlorine free shock currently.

[@SwimUniversity]

@@vVvCuhRazy Oxidizer will be fine if your chlorine levels are good (1-3ppm) and you have no algae issues!

[@WOODYSOOPY]

Can I shock my 6000 gallons above ground pool with regular store bleach, if yes how often and how much bleach, thank you...

[@joelwilliams3115]

I’m a pool guy and use liquid chlorine to shock. It’s cheap and effective.

[@juancortes4520]

How much chlorine should I use if I'm trying to shock a 10000 gallons pool.

[@user-fd7cg5xw7c]

I notice you add the shock to a bucket of water. Does this work best, because I have never tried this, I always put the powder into the pool.

[@len9483]

Always use the bucket system. Dilute the powder as much as possible. You don't want those crystals hanging out all day on your pool floor.

[@brandonruiz7932]

Is non chlorine shock like liquid chlorine?

[@SwimUniversity]

No, it has no chlorine in it. It'll help refresh your free/active chlorine without adding extra chlorine to the water. Liquid chlorine will raise your free chlorine levels.

[@Jacintojudio3478]

I have a 8x24 intex pool that I just brought and I have no clue how much or which shock I should use. I know it’s a small pool but if anyone can help with some tips it’d be much appreciated 🙏🏽

[@johnr7717]

I'd suggest buying a bigger pump than the one that came in the box. And buy a floating skimmer that attached to one of the side of the pool.

[@marksullivan3424]

If you maintain proper chlorine levels you never have to shock. Liquid chlorine all year long baby…2-4Ppm at all times and you’ll never have to “shock”

[@michaelmooney7341]

Calhypo shock much money

[@dharris85]

So I’ve had some algae buildup where the pool has gone a teal colour, I shocked to get the water clear. The next day it worked and the pool went clear so I backwashed filter, the waste was bright green. I then balanced my pool, chlorine is 3/4ppm, PH and Alkalinity are in normal range, I come in the next day and there’s algae residue all over the bottom, when I brush it it’s green so I guess it’s not dead and is new algae. This has happened a few times now. I seem to be going round in a circle trying to keep algae away. Should I try algaecide, or is the filter still not clear and keeps contaminating the newly cleared pool?

[@azsunscards1912]

Same issue here. 2 weeks straight of brushing and vacuuming daily. I have an old sand filter. Still would wake up with shades of algae every morning. I used Leslies clear aid for this issue, try that or some type of clarifier and some extra vacuuming. Should hopefully help

[@dharris85]

@@azsunscards1912 I had another think since this post. I checked the CYA level and it was very low, so I guess I should try and add more stabilized cholrine to boost it

[@I4got]

After you backwash you need to put it on rinse for 5 minutes... Also plain box of Borax will kill algae... Depending on the size of pool you may need 2 boxes... After vacuuming, back washing, rinsing, then put on to filter pour Borax in skimmer to go straight to the sand.... You will be amazed how well this works...

[@I4got]

@@azsunscards1912 Please read my comment in this thread... It may help...

[@azsunscards1912]

@@I4got thank you I had no idea about the borax it’s probably what I needed from the get go. Next algae issue I’ll get familiar with borax lol

[@PieIX]

New salt pool owner. What I don't understand is like this. My pool was too high in salt.Remove water add fresh. Check. Test water again, Salt fine.Chlorine low. Add Chlorine. So from this point onward I have to keep adding Chlorine to my pool? It's just a vicious cycle.Why even bother to convert? What am I missing here?

[@jthoresen]

As a salt pool owner, I also fell into this vicious cycle. The salt cell output is very low. I then discovered this trick. Get your phosphates to zero. This will allow you to run a low Chlorine level, algae free.

[@PieIX]

@@jthoresen Thank you very much. I appreciate the tip. Will give it a try.

[@JGotYa187TTV]

I have a 6000 gallon pool how much bleach would you need

[@steveiliev8912]

Well , we have frogs problem !? 😢

[@1219santiago]

I have FROG system... do I need to shock my pool?

[@SwimUniversity]

Yes, use a non-chlorine shock. You still have some chlorine in your water with a mineral system. And that means it still needs a boost from shock to revitalize the chlorine.

[@TheAxe4Ever]

Stay away from any liquid chlorine. It may act quickly but the Sun renders it ineffective rather quickly plus all it does is raise your total dissolved solids. And over time makes it nearly impossible to clarify your water. The only thing you can do is drain your pool at least halfway and refill it to dilute the TDS. To shock your pool after a rain or heavy use is just use your regular granular chlorine at 1 pound for every 10,000 gallons. Always mix it in a bucket of warm water and disperse in your pool. Again, stay way from liquid chlorine. Keep your PH levels in range and your total alkalinity and you’re good to go. Remember, if your pool smells like chlorine and your eyes are burning, it’s not from too much chlorine. It usually means your free and total chlorine reading are out of balance and it needs to be shocked. Also it means your PH levels and alkalinity are off.

[@frootlooper]

Great comment. I ‘discovered’ liquid chlorine last year. Had nothing but problems.