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Thread: Tri-Chlor pucks and CYA

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    derek533's Avatar
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    Mar 2017
    Edmond, OK

    Tri-Chlor pucks and CYA

    Just a question, but what is it about the pucks that make the CYA raise with constant usage? Is there actually cyanuric acid added to the pucks, is it a byproduct of the chemical reaction of the pucks or what? In other words, what is the mechanism that makes the CYA in your pool rise when using Tri-Chlor as your primary sanitizer?

    If it's just an additive to the pucks, why not make pucks that don't have any CYA in them because they sure are a heck of a lot more convenient than lugging jugs of chlorine around. Just thinking out loud here.
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    Donldson's Avatar
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    Jun 2009
    NW Ohio

    Re: Tri-Chlor pucks and CYA

    Trichlor is short for "Trichloroisocyanuric acid". Chlorine is a gas, it must be attached to something to remain a solid and trichlor is the easiest of these to press in to puck form, but for every 1 ppm of FC added to the pool 0.6 ppm CYA is also added.
    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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    Bigdog43's Avatar
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    Jul 2016
    Memphis, TN

    Re: Tri-Chlor pucks and CYA

    Had the same thought when I got started. It's not just an additive, it allows it be stable in a solid form. When adding chlorine to your pool, fact is you're gonna be adding something else with it. Whether it be CYA with trichlor tabs, calcium with Cal hypo or salt with bleach.

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