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Thread: whats a good cya level to shoot for?

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    whats a good cya level to shoot for?

    My cya level is getting pretty high from using pucks for the last 5+ years right now its about 70-80 what is a good number to hold the cya at? my pool is 38,000 gallon with a sand filter. I live in indiana & the pool does have an auto cover on it. I was going to start draining & refilling this weekend to get the cya down & i have quit using pucks. im currently in the middle of a slam. just wanting to know what a good cya number is?
    38,000 gallon vinyl lined in ground pool with diving deep end.

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    Re: whats a good cya level to shoot for?

    40. Check out the cya cl relationship article and the abc's of pool chemistry in pool school ( I would post the links but I'm in my mobile...)
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
    One cannot follow Islam and Christianity at the same time, nor can one follow pool store methods and TFP at the same time.
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    mrcarcrazy's Avatar
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    Re: whats a good cya level to shoot for?

    IMO, would have been wise to drop the CYA, then start the SLAM....
    IG gunite/plaster pool/spa Started 1/17/14, Plastered 5/16/14
    Size: 12'-21'x39' free form, depth ranging from 4' to 7, attached 6 person spa with spillover.
    Equipment: Whisperflo 2hp pump, Pentair 30" sand filter, Pentair Mastertemp 400k BTU heater, 1hp Whisperflo for waterfalls, and a blower for spa floor

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    Richard320's Avatar
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    Re: whats a good cya level to shoot for?

    Quote Originally Posted by mrcarcrazy View Post
    IMO, would have been wise to drop the CYA, then start the SLAM....
    Me, too. Why use so much bleach clearing water that will just end up on the ground or down the sewer?


    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: whats a good cya level to shoot for?

    yes i realize that now! ( could have saved alot of bleach money) is it ok to do some partial drains while slamming or should I wait till the slam is done?
    38,000 gallon vinyl lined in ground pool with diving deep end.

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    Re: whats a good cya level to shoot for?

    Absolutely ok to do some partial drains while slamming ..... I would.
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
    One cannot follow Islam and Christianity at the same time, nor can one follow pool store methods and TFP at the same time.
    Pool School -- Pool Math -- TF-Test Kit

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    Re: whats a good cya level to shoot for?

    ok I will do some draining when i get home, about how much water will I have to change to drop it from 70 to 40 in a 38,000 gallon pool any idea?
    38,000 gallon vinyl lined in ground pool with diving deep end.

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    Re: whats a good cya level to shoot for?

    Not quite half.

    You will probably need to do it in incriments to keep from damaging your liner. Always keep at least a foot of water in the shallow end.
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
    One cannot follow Islam and Christianity at the same time, nor can one follow pool store methods and TFP at the same time.
    Pool School -- Pool Math -- TF-Test Kit

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    Re: whats a good cya level to shoot for?

    wow thats alot of water!
    38,000 gallon vinyl lined in ground pool with diving deep end.

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    JasonLion's Avatar
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    Re: whats a good cya level to shoot for?

    I wouldn't try to get CYA all the way down to 40 right now. CYA at 70 can be managed if you have to, though somewhere between 50 and 60 would be better. CYA will tend to drop over time if you stop using products which are constantly adding more. You can target 40 longer term.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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