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Thread: What is the rate of CYA that a full cylinder of pucks will contribute to pool?

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    Join Date
    Jun 2016
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    Western Connecticut
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    What is the rate of CYA that a full cylinder of pucks will contribute to pool?

    Hi. My CYA is 90 and FC is 3. CC is near 0. I have a clorinator and use the pucks, which I know contributed to my CYA issue. For the balance of the season, until I can drain the pool a bit, I am going to use chlorine bleach. Per the PoolMath CYA chart, I need to raise the FC to approximately 10.

    However, I am going on vacation and want to be sure that chlorine gets into the pool while I am away, so I will use the pucks temporarily again. Does anyone know the rate of CYA that gets into the pool with a full cholorinator set at a 2.5 setting out of 5? Alternatively, is there a formula for the amount of CYA that gets contributed to the pool by each puck?
    32,500 gallon in ground Gunite/White Plaster, Pentair Cartridge Filter, Pentair Propane Heater, Pentair Racer robot cleaner

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    Mod Squad tim5055's Avatar
    Join Date
    May 2014
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    Columbia, SC
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    8,495

    Re: What is the rate of CYA that a full cylinder of pucks will contribute to pool?

    Right at the bottom of Pool Math is a section called "Effects of adding chemicals"

    Plug in your pool size at the top of the pages and in Effects of adding chemicals use 8oz of Trichlor (most common puck size) and you will see in your larger pool that each puck adds 1ppm of CYA. It really doesn't sound like much but the cumulative effect over time is what gets you to where you are now.
    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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