CYA levels South Louisiana


Aug 21, 2016
Lacombe, LA

I need some advice, and some information. It is still cool down here. Daytime highs in the mid 80s, nights in the low 70s. Last season I was adding about 60 to 90 oz of bleach for my 15,000 gal. pool each day due to dropping chlorine levels during the hot summer days. This season so far I am adding about 50 to 60 oz per day. Is that normal?

The reason I ask is that in a prior incarnation of this type of forum I came across a post saying that for South Louisiana, with our sun and heat, the recommendation was to keep CYA levels around 80 to keep chlorine stable and in the pool. To me this doesn't make much sense, as I understand the chemistry it would be an every increasing cycle. I am hoping someone with more chemistry knowledge than me can set me straight!


TFP Expert
LifeTime Supporter
Jun 7, 2011
Midland TX
Some of us in hotter zones run higher Cya, but I suggest starting out in the 40-50 range for you. Higher Cya is usually recommended for salt pools here, mostly to save wear and tear on the Chlorine generator. Your loss now isn't surprising and it will increase with summer temps and sunny days.

Start out there, and you can always add more to see about reducing your loss to sunlight. Do that, and you'll be good to go.


Well-known member
Aug 30, 2016
Riverside, CA
Probably too high on the CyA if you're not using a SWG and even then on the high side. What is your CyA now? If it is above 60 (should be even less) you need to consider a partial drain and fill. Please report


I may be wrong. I have been before.

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LifeTime Supporter
TFP Guide
May 14, 2015
Cartersville Ga
In answer to your question, CYA is added when using solid forms of chlorine. As long as you use only liquid chlorine or bleach, you won't continue to increase the CYA level.


Well-known member
Jun 22, 2015
St. Francisville
I'm also in S. LA (St Francisville). I have to add a full gallon to my 35K gallon pool in the hot summer. Right now I'm adding between a half gallon to a gallon per day already. My CYA is 50.

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Well-known member
Jun 22, 2015
St. Francisville
I think 40 is a good number right now and 50 is better in the sweltering heat. Definitely want a lower number if needing to SLAM. I'd try not to go over 60 if you can help it.

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