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Thread: How long before I can test CYA after adding CYA to my sand filter

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    How long before I can test CYA after adding CYA to my sand filter

    I have zero CYA. I added 3 lbs of powdered 100% CYA to my 13,500 gallon above ground pool. Based on the pool calculator I should add about 4.5 lbs. The instructions say to wait 24hours, but I read here that I should wait about a week. I added directly into the intake and the pump has ran constantly.

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    Mod Squad tim5055's Avatar
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    Re: How long before I can test CYA after adding CYA to my sand filter

    I stick with the recommended week. Also, most here do not recommend dumping it into the skimmer, rather place it in a sock and hang it in front of a return or put that sock in the skimmer. This way you know it has dissolved into the water and there is no possibility of it clumping up in one of your pipes and causing a clog.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: How long before I can test CYA after adding CYA to my sand filter

    Quote Originally Posted by tim5055 View Post
    I stick with the recommended week. Also, most here do not recommend dumping it into the skimmer, rather place it in a sock and hang it in front of a return or put that sock in the skimmer. This way you know it has dissolved into the water and there is no possibility of it clumping up in one of your pipes and causing a clog.
    Thanks I used the shock method last year but I figured it might be better to put it in the filter because I may dissolve faster since water is rushing through it in the filter. I checked my pressures and they stayed relatively the same....

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    Mod Squad tim5055's Avatar
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    Re: How long before I can test CYA after adding CYA to my sand filter

    It would help us if you would add your location to your profile and the following information to your signature.


    • The size of your pool in gallons
    • If your pool is an AG (above ground) or IG (in ground)
    • If it's IG, tell us if it's vinyl, plaster/pebble, or fiberglass
    • The type of filter you have (sand, DE, cartridge) and, if you know, the brand and model of the filter.
    • If you know, please tell us the brand and model of the pump, and mention if is it a two speed or variable speed pump.
    • Date of pool build/install, particularly important if less then a year old.
    • What kind/model of water test kit you are using
    • Other significant accessories or options, such as a spa , SWG, or cleaner



    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Mod Squad jblizzle's Avatar
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    Re: How long before I can test CYA after adding CYA to my sand filter

    Actually, you would get more water flowing over the sock in the skimmer than when it is in the filter. The water in the filter is not "rushing", it is moving much slower than in the skimmer.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    duraleigh's Avatar
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    Re: How long before I can test CYA after adding CYA to my sand filter

    To answer your original question, it is fine to calculate your dosage, enter that dosage into your pool and then ASSUME it is in there even though the CYA test may not record it for several more days.

    We wish that CYA test was more responsive but it is not so we all just learn to deal with it.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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