How to Get Rid of YELLOW MUSTARD ALGAE in a POOL | Swim University

Mustard algae (yellow algae) is rare and persistent, but don’t fret. By following a few simple instructions, you can scour away this microbial menace, and keep it from coming back.
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⏰ Timestamps:
00:00​ - Introduction to How To Get Rid of Yellow Mustard Algae
01:04 - What Is Mustard Algae?
01:50 - How To Get Rid Of Mustard Algae
02:08 - #1. Wash Your Bathing Suits
02:28 - #2. Clean All Pool Equipment and Accessories
03:15 - #3. Brush And Vacuum Your Pool
04:20 - #4. Test And Balance Your Water
05:07 - #5. Triple-Shock Your Pool
06:12 - #6. Keep Chlorine High And Brush Your Pool Again
06:54 - Pool Care Video Course
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[@SwimUniversity]

Do you have mustard algae (or yellow algae) in your pool?

[@chelsea789]

I think I do, had it last year and ended up buying a new pool. Got all new pool toys! Not sure how I got it again so damn quick again.

[@justinshreve3986]

Im pretty sure we do it wont go away

[@elainebarnard6823]

My family does. We are brand new at taking care of a pool. The videos are awesome.

[@loucatozzi7656]

From the pictures in this video I think that I do have yellow algae. I've been fighting it for the last few weeks thinking that it was pollen from all the trees and plants in the area. It is a mustard yellow "sediment" that I keep vacuuming to waste and also a yellow deposit on the sides of my above ground pool and the wet portion of the ladder/stairs leading out of the pool. I'll try this process and report back how it goes for me.

[@brightstarr57]

Yes, I do...it just won't go away!

[@TheTammyMcDaniel]

You're an amazing resource and person! Thank you for all the help. I recently started taking care of my pool. I always had a pool person, but my guy stopped serving my area. He was so good at what he did - a tad expensive, but because our pool was always so well maintained, we didn't mind. We hired someone new and within 3 months there are pool stains, algae, etc. The guy wanted to charge a small fortune to fix the issues. I fired him and just started figuring it out on my own. I still might hire a pool service in the future (it is a LOT of work), but I feel great I have my pool chemicals, DE filter, etc. in great shape all because of you and some helpful knowledge from local pool company, but mostly YOU!

[@TCS9490]

Very knowledgeable thanks for sharing

[@brightstarr57]

Great video...thanks!

[@user-vo6gx2xb8h]

Thank you for your help!!!

[@PatSnappy]

Yellow mustard algae and I have a long relationship. I've battled with it for a few years now. I live in the New England and the stuff loves my pool. This video is very helpful and thank you. It's been 24 hours and I see a difference, but not there, yet. One comment: I rinsed out the sand filter using my garden hose for about a half hour. (Instead of backwashing) The garbage that ran out was opaque-nasty. Next time I'll backwash after rinsing out the sand to be more thorough. Overall, I'm seeing results, so a big THANK YOU.

[@ryanloughlin6380]

use yellow treat algicide with 2 lbs of shock, yellow treat has sodium bromide which is very effective at getting rid of yellow algae

[@judythornburg1131]

Thanks for the video

[@garrylarmour8209]

Fantastic video! keep it up, some vids are sooo boring to watch and enjoyed yours. I have a 10x24 Intex pool, and mustard algae. I believe I have conquered the worst as my pool is crystal clear today. BUT!I have it floating on the surface maybe do to put algeacide into it? I have been skimming it off but it spreads as I do this. What else should I do. Thanks.

[@mcgregor6274]

I’ve had good results using di ammonium sulfate for mustard algae. Follow the treatment with 2 pounds of stabilized chlorine granular per 15 k of water. The product I used (green to clean) recommended an elevated ph of 7.8+.

[@nbragtop]

You make great videos. I am In N. Alabama 95 and. humid. After watching your video I think I have brown rather than mustard algae. Salt water pool and chemistry is correct except I am 3 bags of salt low. 2190. I have vacuumed to waste for 3 days but every morning there is a slight brown layer on the bottom. I am going to triple shock it tonight thanks to your info. 18000 gal x 6 lbs of shock. Thanks again!

[@SwimUniversity]

👍

[@timquesnelle3512]

Thank You! This really works! I tried a lot of products and liquid chlorine, did not work. Did what is described in this video and bye bye Mustard Algae! I don't ever leave comments but this one is well deserved!

[@SwimUniversity]

Glad it helped!

[@tweetiebird]

You either didn't use enough or your chorine was garbage! always works for me, but you must super shock ir!

[@raeschexnayder]

You freaked me out when you said my name in the beginning!!! 😂😂

[@lalaarmstrong4356]

thanks

[@joerogansforeheadwrinkles8380]

No product recommendation for how to prevent it from coming back?

[@toscane8851]

Hi thanks for your videos! I did the triple shock you mentioned in your video but I added the shock directly to the pool, without dissolving it before. Is this a big deal? How long can I swim again after? The next morning the water is very opaque, not clear.

[@slobodandjordjic8286]

I have a sand filter, I have no waste setting. I have closed, backwash, rinse, and filter. Any recommendations on what I can do ?

[@bw536]

So when I run pump, should it be on recirculating?

[@masa9836]

Two questions - No mention of mustard algaecide. When do I use it? Also, I have a cartridge filter - it's colored mustard yellow! wont hose off. what do I do?

[@user-ei9nx1sz7f]

Great video Love watching your videos I’ve done what you said but it looks like a huge stain Had it before and did what you said and it helped Now ? Maybe needs resurfacing ?

[@SwimUniversity]

What color is the stain?

[@bobwilliams8341]

When you say vaccum to backflush. I know some valves have 3 ports, 1 called waste. My filter is pac-fab (old) it has re-circulate or backflush. So do I move it to backflush to vaccum? Seems like my 20,000 gal. pool gonna be half empty before I finish. And do I clean the grids and add DE before or after vacuuming?

[@dougneal1361]

The water is super cloudy. Will this take care of clarity as well or do I need a clarifier? What about yellow out?

[@robinluich6626]

This stained my pool liner,and it doesn't wipe off. Its very clean in parts of the pool then big patches of brown stains . This stain is now part of my liner. You cant feel it at all

[@robertmoriarty925]

I had my pool chlorine up to 10 ppm, Ph was normal, etc. And the mustard algae persisted. Then, I used an algacide and it worked great. Even at low chlorine levels. Only cost about $40 for the whole summer. I also put my pool toys, equipment, bathing suits, etc. In the treated water so I wouldn't reintroduce the algea. This is in Northern Illinois.

[@robinlommori3440]

I’ve had this same issue. Yellow algae and the pool supply store kept saying to shock it. Well turns out yellow algae is resistant to chlorine! You need an algacide to get rid of it. I used yellow treat.

[@mikebell7394]

What kind of algecide did you use? I cant get rid of the mudtsrd algae

[@gordon666420]

I killed the mustard algae with liquid chlorine. 1 gallon for 6600 gallon pool

[@iceymalka209]

@@mikebell7394I use a commercial product by EZ-Chlor but if you do get a algaecide without copper so you don’t accidentally raise your copper levels depending on where you live and what’s in your water

[@tweetiebird]

for 6,000 gals could be enough @@gordon666420

[@TheBriarWolf]

I fight this stuff every year, but my pool is out in the middle of a conservation area right smack between 3 ponds. Evidently it’s commonly found naturally on trees around ponds. I highly recommend following these guys instructions as they have worked for me and balancing that ph and getting the right amount of chlorine seems to be key. Also you’ve gotta be prepared to waste the hell out of the water to flush it out of the system and get it out of the pool. I’m hooked directly to a well with the pool, but if you’re in town that’s gotta suck. I’ve heard there are methods at filtering it out of the water but only directly flushing it out has ever worked for me. Goodluck to anyone else fighting this crap

[@SwimUniversity]

Sorry you have to constantly battle this, but glad pH and chlorine balancing has helped!

[@Horselo285]

What do you do if you have an Intex style pool with a cartridge filter and no way to vacuum to waste? 😭

[@mdnitewind7004]

I wasn’t sure if it was yellow algae or just dirt and debris that started after a chilly week of no swimming or using the pool. But it was yellow. Although as I’d vacuum, it’d look more brown. It didn’t climb up the sides of the pool, but kept spreading on the bottom. After vacuuming and shocking it was extremely cloudy. A few days later it was less cloudy, but still too cloudy (white, foggy cloudy) to want to swim in it. Between that and cool weather it was still not being used for a few weeks. It then got yellow all over the bottom of the pool again. It’s a small above ground pool, a little over 4000 gallons. I’m recovering from chemo and dealing with lymphedema so it took me four days to vacuum it again. I just shocked it last night. It’s super cloudy again. The new filter was green after all the vacuuming, so it got rinsed out. I’m not sure whether to shock it again and then a day or two later add clarifier? After not the best swimming weather in August, it looks like it’s going to get hot and humid again in a few days - perfect swimming weather,. But I’m feeling stressed that the pool might not be swimmable in time if I can’t clear up the water. Swimming has been a huge help physically for me. Not to mention fun, which I definitely could use this year. I can’t reach under the steps though to vacuum or brush. But yet it still had stayed clean as far as no yellow or dirt on the bottom for over a week or two. But then we got some more not so great weather, and I’m not able to constantly vacuum, and the slight cloudiness got worse again and more yellow on bottom. There were some leaves and tons of tiny dead bugs this last time I vacuumed the past few days. Lots of that sort of stuff in the water. Last year was so easy to maintain, no problems at all, although I had help, and it was being used constantly, and the weather was better. Not sure what to do next to get it swimmable within the next few days, if that’s possible. I would absolutely love even just a few more days of swimming before the summer is totally gone for the year. Any suggestions?

[@r.skinner4420]

My pool does not have a waist valve. It just has the four filters. How do I get the mustard algae out?

[@sunsetstripboston]

Do you vacum first? Then add shock? Or does it matter?

[@anthonyrusso9006]

What if I have salt water pool .. which shock should I use ?

[@amandasiekbert1155]

I have a serious yellow algae problem in my intex 15x33 pool. Not 1 single vacuum has picked up the algae 😩 it just blows it all around. I don’t know what to do to get it OUT! Help!

[@minterangela3]

My filter doesn’t have a pressure gauge. How soon after the “triple shock” should I run a backwash?

[@courtniecox]

I just installed the PoolRX into the skimmer (from your site). Within 24 hrs, I'm seeing this. Thought it was sand from the sand filter but it's not grainy. I thought going to a mineral system was supposed to prevent this ("eliminates all algae")??

[@tweetiebird]

Skew balancing becuase super chorinating is going to push your PH up up up, get rid of the algae and then balance

[@Holly_Ho]

... I don’t even have a pool and I’ve watched all your videos 🤣

[@enevarez1471]

You’re ready for a pool

[@christinas907]

😆

[@alexidonovan5491]

So after getting rid of it do I use algaecide every week to prevent it from coming back?

[@sleepygrits1899]

So after the shocking and killing the mustard algae, does it settle to the floor and you have to vacuum?? Or is it just gone?

[@chriswood4097]

ok, love ur vids, but what do i do if i have an above ground pool with a bestway/intex? cartridge filter? 10,000 litre pool (not sure of gallons atm) and the filter pumps almost all of that in one hour, so it’s a good one. i can’t filter to waste though! do u have any tips for this kind of setup? i also just fitted a salt water chlorinator and have a tonne of mucous blocking up the filter. chem levels are fine. flow and chlorination are good according to the new system. please can u help? we’ve already had a couple of weeks of 38 deg celsius and it’s not even summer. i just wanna use my pool and enjoy all the money i’ve spent on it lol

[@chelseachristopher1585]

If I have a dolfin do I need to take it out the pool and clean it?

[@74sheada]

8 week old pool plaster. Tahoe Blue Diamond Bright. I'm dealing with 1 week plus now possible yellow algae or metal stain. Pool was 99% covered equally with a yellowish/light brown somewhat slick substance. I'm in Houston. Had major landscaping jobs with lots of fertilizer AROUND the pool done, but was careful to remove debris immediately. Some leaves, branches, mulch fell in pool but I was right there with the skimmer to clean it up to ensure it didn't stay. Organic matter was a concern when we moved in (two months ago as well) so we removed most of our trees and bushes in the back near the pool other than a large Magnolia tree which is next to go because it sheds too much. One day the pool was blue, literally the next it was covered. I was treating a brown spot from tree dropping with a little acid and noticed it was bright blue. Compared to the rest of the pool I realized that I had a problem. First test showed 8.0 PH and low chlorine. Starting lowering the PH with 3 gallons of acid and the material washed off immediately on the steps and areas I poured it into, however everywhere else was really unaffected. Seems like it all happened after the landscaping jobs, fertilizer, mulch was all done-despite ensuring nothing was getting in the pool. Perhaps the rain washed fertilizer into pool and caused a metal reaction? I used Ironite on the plants which obviously could stain but was careful not to get anything in the pool. Chemicals were checked weekly perhaps a little less than they should have been admittedly. Chlorine a little low. Phosphates were 1,500! Two different pool stores testing my water said to get rid of phosphates, quadruple shock, algae feeds on phosphates, etc etc. Pour the chlorine in-gets a little cloudy brushing even with wire brush doesn't do much. I have triple shocked the pool 2-3 times in this time, running a perfect PH and got phosphates down to zero. After a few days got water perfect. Pool plaster company is blaming chemicals and that it's absolutely yellow algae. I hired another pool company to come out and they tested, felt, brushed and looked at the substance and said it was not algae. Especially after the high chlorine and shocking. Pool stores testing water gave me yellow out-and it immediately got rid of whatever it contacted, but those are very small bottles. Pool stores are saying it's not algae, that it's stain from the phosphates. My metals were little high one day, but nothing crazy. Been testing water every day. So far the only thing that lifts the stains is yellow out or acid, but just in small areas. Was told that I should drain and acid wash the pool. I have a 16,000 gallon pool. Changed filters and there were huge clumps of green smooth and slimy matter all over the filters and chunks in between no doubt slowing the flow. After the change pool seems to be getting a LITTLE better but not as fast as I'd like. Pool plaster company wants me to dump hundreds more of chemicals and snake oil into the pool... pool stores laughing all the way to the bank and my arms/back are sore from scrubbing. How long should this stain persist? And how do I know what the heck it actually is??? I've got about $600 in a little over a week in chemicals and filters and dozens of hours brushing and still about 75% of my pool is still covered. Only the steps are starting to show the beautiful Tahoe Blue new plaster color I was seeing a little more than a week ago. Please help! Thank you!

[@AllAspects.]

Oh man that's very sad. Is it OK now??

[@avianorobc8847]

I have a persistent black stuff in my pool it settles on the bottom and is very easy to brush but it keeps coming back. I don’t know what to do.

[@kelseyelam-dc7xc]

How long typically does it take for the yellow algae to go away?

[@JasonandMelissaHarper-qb8uq]

What do we do if we have about 2ft of water at the bottom of our 16x30ft above ground pool, and it very clearly has mustard algae in it? We didn’t have our filter or anything plugged in yet because we are just at the beginning of the swimming season.

[@jeanninemorelli-cary927]

My pool is balanced with the chlorine on the high end. I am brushing my pool twice a day and cant keep up. When I brush I make a yellowish cloud. My pool is 18x36 vinyl and I am Upstate NY. the water is clear enough to see the bottom of the 4' end but cloudy at the 9' end. Is this Mustard algae?

[@krystalschultz5608]

How do I know it's dead? Will the residue on the bottom go away on it's own? Or is a vaccum the only way i can do it?

[@Zeppelingirl123]

When can we go back in after doing all of that

[@laurenhenckel8961]

It’s in my sand in my pool filter should I get rid of that sand an bleach sand filter?

[@phil_8367]

I deal with the same drama every summer. Here we go again

[@johnroberts7018]

I have SO much liquid chlorine I don't want to buy several bags of Cal-Hypo to do this so can you just tell me what PPM of chlorine I need to maintain instead?

[@nashira222]

I know you said it's rare but what if you have a cartridge filter? Seems like it's too fine to catch it.

[@dwainbostic250]

How do I find out what kind of algae I have?

[@stanleykeith6969]

What is a clear algae, looks like clear slim floating in the water. My wife gets it with a leaf skimmer with a fine mesh. I think we got it. Saw it last summer when we were into swimming about a month. What is this jelly looking stuff ?

[@mikenotyou8852]

Before finally coming to the realization that I have mustard algae, I have been aggressively shocking my pool with liquid chlorine AKA sodium hypochlorite. With the high levels I have now should I still do as you say and shock the pool with calcium hypochlorite as the video suggests

[@mohanadabdullah829]

Ohh man I can’t thank you enough for this amount of information, But anyway thank you so much, it works like a fucking magic 🤣, I saw your video by chance while I was looking for a solution for this, especially theses days, wish you guys all the best, stay home, stay safe ❤️❤️

[@TravisTried]

I get the gloves mask and goggles for the video lol but do you really where all that in the heat while cleaning or clearing algae? Still love the videos

[@CrazysAngel]

Husband went to close.pool. brushed n shocked n then back washed. Bunch of yellow he says in the sand filter. Meanwhile he lowered the water n ik expecting so cant even shock it now. Help!? Its cold enough to close so it shouldnt grow until spring but wht can I do? Add bleach straight to the sand filter?

[@joleneweaver7578]

Is it same as silt

[@kathryn3223]

Thank you from a couple of newbies! It seems like we’ve been doing everything right....until we re-contaminate it again...on accident.

[@TheArtsyPineapple]

I brushed my 5500 gallon pool and added almost an entire gallon of liquid chlorine, but the mustard algae was already settled to the bottom again and this morning it’s all still there PLUS some. What do I do?! 😭😭😭

[@seanwanlass2501]

This triple shock method stained my pool plaster really bad. I diluted one pound of shock in a 5 gallon bucket of water , mixed it well. White blotches all over blue plaster. I can’t brush the stain out. 🤔🙄

[@scottzwart7724]

When I used a lot of shock my pool turned purple. Why

[@shanewelborn2845]

Rare,, hell I get it all the time.

[@heckeroffical3862]

What

[@stevehines9344]

I get it all the time also. And I’m in Michigan. And I don’t ever swim in lakes or ponds that it could transfer from.

[@cavy95]

Got it here in Massachusetts, second summer owning a pool. I think I got it from my plastic ladder that I dropped in. It was laying in my lawn all winter. No idea. Time to buy some bleach!

[@emilycooke1726]

It is my NEMESIS!!!

[@cavy95]

@@emilycooke1726 mine is back! Another round of algi treatment

[@joshriver75]

Ive got it in a new pool (been up for a year) but nobody has been in it at all yet. everytime i think its gone it comes right back within a couple days. ....im stumped.

[@tonyperez2690]

What if I don't have vacuum to waste on my system?

[@lexy6779]

Hi there! Im in the process of doing your triple shock method, curious, I have an above ground pool and the filter/pump doesn't have a "waste" function. Suggestions? Thanks!

[@SwimUniversity]

You could vacuum through the filter but with the drain valve open.

[@connellyslandmanagement725]

So does mustard algae turn into a dust? Or does sand do that?

[@cyborg1117]

not sure what i have , looks like yellow mustard, but stuck to liner in the whole shallow end wont come off, tried everything pool is only 7 years old? been shocking quad amounts, brushing , will not come off liner, inground pool , any suggestions anyone? thanks

[@KushKats420]

I got a tree that when rains the tree looses alot of pollen and at first i thought it was its this and the tree is the reason why the pool gets contaminated

[@joknowsbesthappy4362]

I treat with yellow out add a jug of Chlorine and the same time. Then follow up the next day with another jug of chlorine. COMES BACK IN ABOUT A WEEK :( what do I need to do????

[@nickmartin8495]

If it’s chlorine resistant how does shocking chlorine work?

[@BarbaraJensenhomesramona]

So I just did the shock the sh&$ treatment overnight brushed it again this morning because there is still algae on the walls. Mostly in the deep end. And now in looking at it again it appears green to me. Help! Can’t scrub hard enough to get it off the walls.

[@saladad4347]

With about back wash the pool after Tripel shock

[@Aloha96789]

Didn't work. However Stop Yellow killed it in it's tracks. Disclaimer, we've been having a lot of rain here in north-east Florida and anything on the pool screen gets rinsed into the pool.

[@chriswilliamson7495]

New owner of a house with a pool. We have a pebbletec pool so I really can't tell if the debris in the bottom of the pool is dirt or algae. It clouds up when you brush and will make the pool super cloudy until it settles again. I have a Hayward 4 cartridge filter, with no way to bypass the filter to waste. I do have drain plug on the filter. I have read that i should not manually vacuum through the filter. Whats your best solution and what's the best way to figure out if this is dirt or actual mustard algae. As of this morning, The pool is balanced.

[@michaell6645]

I’m sure you’ve figured out by now but touch with your finger and see if you can lightly “push” it.. if it goes up in a small plume and doesn’t settle immediately, it’s most likely algae and not sand.

[@aneshadeweese3604]

Does this work for salt pool? I have an above ground 24'. Thank you 😊

[@joshtaylor2871]

First of all i suggest against above ground pools running salt chlorinators because of rust issues. Second salt pools are chlorine pools. The salt ionier uses salt in the water to produce chlorine. The short answer yes, it will work.

[@Mvango1]

After you do the first triple shock do you leave the pool filter on filter or do you leave it on circulate?

[@CSProduction12]

Always circulate

[@billybrooks1]

Yellow gone. Added it a month ago. Haven't seen it since

[@kroc5530]

My pool guy already shocked the pool, how long till the algae is gone?

[@fishinman539]

Dealing with it as we speak

[@Burntshocker]

I thought I was seeing DE on bottom of it pool. Now I think it’s algae. Pool is crystal clear but sandy piles on bottom. Driving me nuts. I’m gonna vacuum it up then clean out my filter. Now waste multi port on my de filter

[@danielmason1326]

Definitely seems like i do.. I can run the filer over night .. Turn it off ..vacuum.. Rebalance pool .. Leave it sit over night. Come out the next morning and all looks great ... Switch the filter to recirculate and within minutes ... You can see piles of algae acclimating on the pool floor... And just keep building up in more and more spots .. In an hour the pool floor is patchy throughout .. And that's without filtering... Just recirculate.. Which leads to to believe that even tho im sure its in the filter as well ... Its still in the pool.... Just weird that if a leave the pump off workout recirculating .it'll take about a day and half before seeing any major accumulation... Will that 3x shock method also take care of whatever is in the sand filter and plumbing ? Or should i pull the filter and clean out the sand adding if needed ? 20k above ground pool with skimmer and floor drain... I replaced most the pipes before opening the pool this year as alot cracked over the winter.. But never investigsted the sand filter as it was brand new last year..

[@XLikeaBoss23X]

The problem with brushing it stirs it all up

[@pariscaldwell0807]

Should I mix it around so it's broken up and floating? Or is it fine just sitting on the bottom of the pool? Thanks!!

[@AllAspects.]

I believe u don't need to mix. Its chlorine resistant anyway. Just vaccum

[@loslobos9461]

Can mustard algae appear gray?

[@dorothygarcia9102]

I have an above ground pool intex 12x30 I drained it. Can I just clean the liner and all other items with Clorox bleach and it solve the problem or do I still need to refill and shock it to kill the Mustard Algae?

[@pinpanther1]

Did you try this and did it work cause that’s what I’m attempting

[@ritahensley426]

Is mustard algae gritty? I have brushed and brushed and it's not coming up...I have spent hundreds of dollars!! Every time I go to the pool store he tells me to get something different!!! Help!!!

[@AllAspects.]

First u said they're chlorine resistant then u said shock pool. How?

[@LeahHa8]

@swimuniversity does this work for saltwater pools? Newbie here.

[@SwimUniversity]

All the steps are the same, just use either dichlor shock or liquid chlorine shock (not cal-hypo shock: that can create calcium build up in your salt water cell). You can even try running the "superchlorinate" mode on your salt system to see if that helps.

[@miranda148503]

Do you vacuum the pool to waste the morning after the first triple shock treatment or do you brush again if you still see it & triple shock it again until it’s gone?

[@wesshaffer9638]

I'd sure like an answer to your question as I've wondered the same thing.

[@Bunkysworkshop]

So I have a 30,000 gallon pool and want to do the triple shock method. I need to make sure I’m understanding this all the way. Am I using liquid chlorine or the bags of powdered shock? Please let me know how many of gallons because I do know that if its bags of shock I would use 9 bags. Right?

[@brianmccrary7615]

I did 4 lbs for 15000 gallons.

[@master-barber]

Thanks for your video. I have a problem with mustard algae. I did your process and it didn’t go away. Tried 6lbs of shock the second time. Seemed to go away for a week and now it’s back. I have done everything. Not sure why it keeps coming back. Will flocking help?

[@gordon666420]

I am in Arizona and just had a run-in with the mustard and I use liquidated chlorine shock instead of what they recommended. I added 1 gallon for my 6600 gallon pool. worked like a champ. putting chlorine puck in my skimmer to keep chlorine levels slightly elevated and evenly dispersed in the pool.

[@Scott-or3ru]

I believe mustard algae is my friends’ problem. South Houston, sand filter. All summer we vacuum to backwash Butt, it’s back quickly and runs Kreepy Krauly as usual. I am certain the sand filter needs to be addressed. I did get him to follow your steps once. (once, not all Three treatments) Questions: any special instructions for filter? If you’re instructions are followed will filter be clean?

[@AllAspects.]

It's so devastating!! No more waste mode. Just wasting water for nothing. It all comes back again

[@ninaeverson3807]

I have a vinyl liner so I don't use Cal-Hypo shock (It completely bleached my last pool liner). How much Di-Chlor shock should be used to treat mustard algae? Is it the same - 3 pounds per 10,000 gallons? We've used Yellow Out and triple shocked it, followed up after 24 hours with a regular shocking and it came back after 2 days. Any recommendations?

[@dinoparton6598]

You didn’t say if we should turn off or on the filtration

[@samantha-jane5758]

What I have done is emptied the pool I've used a surface cleaner that I got for my local hot tub supplier of wash inside and out I'm going to clean my filter and heater with the cleaner then move pool up from the trees a lot my chemical levels are low write my PH and my alkaline are low .

[@joelhuggins7502]

Thanks for this video. Couple questions: 1) So my pool cover is now trash, huh? Effectively cleaning it would be very very difficult. 2) our pool guy (we rent) just brushed it and put algaecide in during mid afternoon. No shock. That won’t be effective, will it? I’ve had to brush and vacuum myself multiple times since then. 3) We suspect said pool guy brought the algae in, but we do have tons of tree crap that blows in from all over the neighborhood. Could that also bring it in? Trying to determine if having a laissez faire pool guy is going to cause me problems and cost us swim time all summer. Thanks again!

[@jdefloris]

I am wondering the same about the summer bubble cover... is that what is bringing it back into the pool in our case? I did scrub the top with the 1:10 bleach solution as I rolled it, and the bottom is in contact with the triple shocked water... hoping for a reply from Matt Giovanisci.

[@eihthype6578]

If it’s chlorine resistant, wouldn’t cleaning your pool toys with Clorox bleach spray be ineffective?

[@alklesczewski1207]

How does the algae stick to surfaces? You talk about brushing the algae. I tried brushing, but nothing comes up. I put in 7 bags of shock one day, and although it looked a little better for a day, the liner was still stained. (15,000 gallon, 24' round). These stains were not there last year. I could not even brush it up with my hand. It is not slippery at all. Could this be something else? thanks!

[@LeahHa8]

Did you get it resolved?

[@juliawilkison9044]

When I brush the mustard algae it just clouds all over. When I vaccum it same thing. My alkaline and PH are perfect and my chlorine is extremely high and I can't get rid of it. Please help!

[@mommaray9238]

Let the algae settle to the bottom. So pump should be off for 24 hours then shop vac it off the bottom very carefully. Took me forever to get rid of it but I finally figured it out.

[@cindipeek3727]

Can I use this method with out a pool pump?

[@SwimUniversity]

You need a pump and filter for this

[@shirleeriddle6650]

Thanks for the insight. I have done exactly/exactly/exactly as you have indicated and I still have yellow mustard on the walls. I have brushed and manually vac'ed and still can't get rid of the stuff on the walls. Can you help?

[@thejoker5307]

🙉