Chlorine Kill Factor, pH and the Relationship with CYA in the Water

[@JonathanLGN]

Thank you David!!! Love all these podcasts. Just finished my CPO today (online). Looking forward to gaining even more knowledge! The instructors emphasized the relationship between pH and chlorine but we did not go over the relationship when you introduce cyanuric acid.

[@SPL]

Congrats on your CPO! 👍

[@ladyjwc7505]

You have saved me so much headache. No more PH chasing for me. PH 8.0 CYA 50ppm Chlorine 3.0ppm.

[@JuanSanchez-tk4vr]

Me too. But I'm going to try 30 CYA like he recommended. We will see the results.

[@ferk9331]

This is not going to cut it. At that PH, you will need 6.4 ppm free chlorine to obtain 0.05 ppm HOCl, the killing chlorine form. Look for "2.0 to 4.0 Free Chlorine May Not Work" From Bob Lowry. I don't know why Eric kept saying PH is negligible when CYA is present. That contradicts Lowry's Bulletin.

[@slimjim77M]

This is the cutting edge of pool care info here. Well done!

[@SPL]

Thanks for the great feedback! 👍

[@gwolfeman]

Every pool guy should definitely take a good listen to this!

[@matteogiancola9913]

Dave, you are truly a legend! You are offering all the knowledge (if not more knowledge) to all people at the pool world for free! Keep up the good work and stay safe!

[@SPL]

Thanks for the great feedback. Stay safe as well! 👍

[@four20smp]

Wow! Great video!! This video should be played at every CPO, and AFO class!!

[@aheathenoutdoors]

Thanks for the timely podcast. I have a client who's CYA is 150. Draining is the ONLY way to go but client will not sign off on it. Been trying for 3 months. And what do ya know, 2 weeks ago has an algae bloom. I tried to explain what needed to be done and why. Still won't drain. I gave him notice either drain it or I will be cancelling his service. Alas, this was his last week of service.

[@SPL]

That is too bad. It is not a huge cost to refill as many believe...

[@scottlandb6579]

He/she will regret it when their plaster gets destroyed!

[@djuforeo]

I decided not do to drain my pool after I had a CYA level of 110 in November. I've been using PoolRX to combat algae bloom while the sun evaporates the water. Did a reading last week and my CYA is down to 60 ppm by slowly adding in water. It's not the ideal scenario, but a cheaper option while the pool isn't being used.

[@jccjmml7]

Keep in mind that sodium bromide algaecides work great on pools with high stabilizer and the pool owner is stubborn. I've got pools going on 3 years this way in the summer because owner refuses a drain, wash, and refill. A little dab of yellowtrine every few weeks might save your customer.

[@aheathenoutdoors]

@@jccjmml7 After talking with him he feels he can take care of his own service and paying someone isnt worth it. Maybe he can...but he was doing that prior to me and his water was waaaaay out of balance anyways. He loves his 3" tabs. I think he has been shocking his pool in between service tha last week. Tuesday his Chlorine was 10+...and chlorinator filled to top with tabs on a #3 setting.

[@owenblair2571]

Excellent! Thank you!

[@SPL]

Glad you enjoyed it!

[@JuanSanchez-tk4vr]

WOW he recommended 30 ppm CYA. I'm going to try it.

[@SPL]

Give it a shot. 👍

[@bobdecker2446]

I did a 3/4 drain after adding a phosphate remover and have an almost undetectable CYA reading now. Also I have switched to non stabilized liquid chlorine. What are your thoughts on introducing a solar powered pool ionizer? And if so, which one do you recommend? Thanks for the videos, I am gaining control over this pool!

[@Sammy31Dee]

I have really low ALK and PH...it's not readable on my tests....I have really high CYA 125....is there really no way to remove this CYA ....I mean I just filled the pool 50% after opening....should I attack the low alk/pH then the cya? Or just drain ? Total pool noob....first season in new home

[@vito5266]

Hi Dave,thanks for all the good info you put out in all your vids,hard to find a pool service guy who is as knowledgeable as yourself!! Do u happen to service equipment in So Cal? Let's say I need a repair,or want to add something to my equipment,such as an ozone system or automatic chem dispense system, just some stuff I've been tossing around for a while. Is that something you would be able to do?

[@SPL]

Thanks for the great feedback. Maybe not personally but I have two guys who do all the installs for me in my area. What city are you in?

[@vito5266]

@@SPL Hi,thanks for your quick response! I'm in Corona.

[@SPL]

I have a good guy for you. He does all the warranty work for Hayward and Jandy but can install anything. email me at [e-mail] and I will give you his number. 👍

[@vito5266]

@@SPL 👍

[@ngtatsang7690]

my stabilizer is 100ppm, does that mean I need to drain my pool? Huge thanks for your videos/blog.

[@SPL]

Maybe just about 1/2 of the water. Thanks for the kind words 👍

[@azbasshead]

Do you have an opinion on using non-stabilized chlorine tabs?

[@SPL]

They don;t seem to work as well from what I hear. I haven't used them yet myself. Those would be the Cal-Hypo Tabs.

[@scottlandb6579]

David I think I’ve asked you this before but I’m going to again. How frequently are you running lsi tests while servicing accounts. I mean the sad truth is it takes way to long to pull calcium numbers when your knocking out 14-20 accts a day. Are you digitally via Hach testing calcium levels? I’d love to run LSI on my pools but whose got time for it? Also people don’t fear the cya, just use it appropriately!

[@SPL]

Once a month in most cases. Can't do it every week if you have a big route.

[@scottlandb6579]

Swimming Pool Tips, Reviews & How To Are you testing calcium w/ a Taylor test kit? Or do you use some other form of testing?

[@statusworldsong7682]

Chlorine

[@sherryhodge5800]

I have algae and the cyanuric acid is high what can I do

[@SPL]

You can do a partial drain or try something like a PoolRx in your pool.

[@sherryhodge5800]

@@SPL where do I get pool exit?

[@sherryhodge5800]

@@SPL where do I get poolRx

[@MrDamasta1860]

Amazon

[@himasf]

Great.. now I have to worry about this LSI thingie too. I frikkin' hate having a pool 🥲The problems just never seem to end and they all cost money.

[@SPL]

Well said!