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Thread: Puck without CYA?

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    Puck without CYA?

    Is there such a thing as a chlorine puck that DOESN'T build up CYA??
    16 x 32 In-Ground vinyl, 21,000 Gallons, Hayward Cartridge Filter, Hayward Tiger Shark robotic cleaner, Taylor K-2006 Test Kit

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    Mod Squad tim5055's Avatar
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    Re: Puck without CYA?

    No, all pucks have CYA

    Be careful, many pool stores will show you the ingredients which may say 98% TriChlor and comment - see, no CYA. TriChlor & Dichlor are just different formulas and both have massive amounts of CYA.
    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: Puck without CYA?

    What about the cal-hypo pucks? Those are bound to calcium not cya aren't they?
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    Mod Squad tim5055's Avatar
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    Re: Puck without CYA?

    Quote Originally Posted by borjis View Post
    What about the cal-hypo pucks? Those are bound to calcium not cya aren't they?
    Yes, you are correct - but the method of manufacture for Cal-Hypo pucks makes them very soft and they melt extremly quickly so their use as a slowly dissolving chlorine source just isn't there.
    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: Puck without CYA?

    Quote Originally Posted by borjis View Post
    What about the cal-hypo pucks? Those are bound to calcium not cya aren't they?
    Yes, but they are fairly difficult to come by and require special feeders because they break down so fast. Trichlor can easily be pressed in to a slowly dissolving puck, cal-hypo cannot. Then they also lead to calcium buildup, which can be even more of a pain to deal with than CYA buildup.

    Chlorine is a gas naturally, it must be bound to something to be held as a solid or liquid. Currently the only available options for solids are CYA, calcium, or lithium. Lithium is harder to come by nowadays and with lithium-ion batteries becoming the norm it is only going to become more expensive and less available for use as a chlorine binder. If a chemist can come up with a new option that doesn't involve one of those three then it could be a very lucrative discovery.
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
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    borjis's Avatar
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    Re: Puck without CYA?

    Interesting...didn't know the cal-hypo pucks dissolved fast.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
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    Re: Puck without CYA?

    Dimethyl hydantoin (DMH) is also binding chlorine, but I do not know if dichlor diethyl hydantoin is available on the market. DMH is mostly used as a bromine carrier, and the pucks are very slowly dissolved in water.
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    Re: Puck without CYA?

    Which part of a water molecule does the chlorine bind to in liquid form?

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    Re: Puck without CYA?

    Quote Originally Posted by pinguy View Post
    Which part of a water molecule does the chlorine bind to in liquid form?
    Sodium-hypochlorite
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
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    Re: Puck without CYA?

    Chlorine binds to the OH group to form the hypochlorous acid.
    South of France inground rectangular 17k pool - ruber membrane. Sliding dome, black thermal blanket covering 75% of the pool surface. Aqualux 3/4Hp pump, glass media sand filter, Zodillac robot, 110W UV-c lamp, Hayward brominator, Caliente 12kW heat pump.

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    Re: Puck without CYA?

    The store where I got my pool sells both pucks (cal hypo and trichlor) and bags supposed to be for shocking only. I ocassionally use the dichlor bags for my daily dose, even though the bag directs to use all at once, but I use it only when I'm raising CYA, as I have a small pool and can't see buying those large amounts of CYA packages; works great; only mildly acidic; and I keep it sealed; dissolves much better than cal hypo and doesn't cloud my pool or leave a residue like cal hypo does and takes only 1.7 fluid Oz per ppm in my little pool. The only issue is that I have to dose for a while, then test, then repeat. My pool doesn't seem to increase CYA at the pool math level, so I usually must use more dichlor than the math shows. The FC effect though, is right on the money.

    I've seen them directing customers to the cal hypo pucks once they've achieve pretty high CYA, but I didn't know they dissolve quickly and wonder how they tell them to manage those pucks or what they tell them if the customer is at the upper range of CH and CYA, since they don't sell liquid. Of course they're like most stores and call for that under sanitizing 1-4 level irrespective of CYA, but at least they don't let them keep stabilizing until it's time to drain.
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