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Thread: Solid/Granular CYA

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    Solid/Granular CYA

    TFP states that you add solid/granular CYA by placing it in a sock and leaving it in the skimmer. Does anyone know what would happen if we didn't use the sock and just dumped the solid/granular CYA into the skimmer? I was just curious.
    24K gallon, IG, plaster, Pentair Clean and Clear Plus Filter, Pentair Heater, Pentair Intelliflo pump, Built in March 2015, Taylor K-2006, Spa included

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    Mod Squad jblizzle's Avatar
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    Re: Solid/Granular CYA

    Very rarely it could clog the pipe, but not likely. The issue is you never know when it is completely dissolved and it will take longer since the flow rate is slower in the filter. Plus if you clean the filter too soon you will lose some of the CYA.
    Jason, TFP Moderator
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    Re: Solid/Granular CYA

    Thank you. I forgot one more question. What happens if you leave the CYA in the sock with the pump not running? I programmed my pool to run 24/7 after I added the CYA but for some reason, I found the pump off when I got home from work. Is this bad?
    24K gallon, IG, plaster, Pentair Clean and Clear Plus Filter, Pentair Heater, Pentair Intelliflo pump, Built in March 2015, Taylor K-2006, Spa included

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    JoyfulNoise's Avatar
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    Re: Solid/Granular CYA

    CYA is acidic. A lump of granular CYA sitting in the skimmer, or in a pipe, or in the bottom of the filter, can easily take the water around it down to a pH of ~4.5. That's not catastrophic, but it's not good either. The sock method ensures that the CYA dissolves to a fine enough extent that the particulates of CYA will tend to stay suspended in solution as it slowly dissolves and disperses. The best place to put a sock full of CYA is not in the skimmer but in front of a pool return (usually hung there by some kludge of PVC or sticks) as having a large volume of fresh pool water around it allows it to dissolve quicker. Sitting inside a skimmer is a less optimal choice of locale (although I have done it to be totally honest). You can even float the sock in a blue chlorine puck floater if you happen to have one.

    Easiest thing to do is to cut up a pair of old nylons and use that as the sock to hold the CYA. Works great.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Mod Squad tim5055's Avatar
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    Re: Solid/Granular CYA

    I added some last week and just poured it into the skimmer sock in my skimmer basket. The mesh on the skimmer sock is even finer than a regular sock. The CYA had dissolved in under an hour.

    That reminds me, time to test again.....
    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 kimkats's Avatar
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    Re: Solid/Granular CYA

    Quote Originally Posted by Brian T View Post
    Thank you. I forgot one more question. What happens if you leave the CYA in the sock with the pump not running? I programmed my pool to run 24/7 after I added the CYA but for some reason, I found the pump off when I got home from work. Is this bad?
    That is not bad as it was going into a large amount of water. The pump running will help it dissolve faster. I go so far as squeezing the sock until it is all gone. I like to get it over with!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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