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Thread: How rapidly does CYA build up

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    Join Date
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    How rapidly does CYA build up

    Just refilled a 30,000 in ground vinyl pool and the CYA is very low. I'm using 3 Tri pucks in the two skimmers till the CYA level is where I need it to be then I'll switch over to Di pucks.
    I don't want to necessarily add extra CYA till I see how fast the pucks bring the proper level up to standards.

    Thanks...
    20x40 30,000 gal IG Liner, Pentair II Sand

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    duraleigh's Avatar
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    Re: How rapidly does CYA build up

    Hmmmm. You're gonna' have to go thru a lot of pucks......and I mean a lot of pucks.

    I'm doing this from memory so bear with me. I think I used about 20 lbs of CYA to get my 43k pool up around 30ppm. I'm sure my math is wrong but it's close enough for this discussion. So you'd need somewhere around 15 lbs for your 30k pool.

    If tri-chlor tabs are 75% available Cl (or thereabouts) then somehwere around 20% is CYA.

    That leads me to think your gonna' need to dissolve about 75 lbs of tri-chlor pucks to get to 30ppm.

    I'm sorry my calcs are based on such a fuzzy memory but I'm not off by a ton. In short, you're gonna have to get some CYA in there other than thru pucks.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
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    First a queston, what are di pucks? Dichlor is a fast dissolving granular chlorine and does not come in pucks.. Pucks are trichlor. (Cal hypo comes in capsules or tablets, not really pucks. They won't add any CYA.)

    Dichlor will raise your CYA faster than trichlor. For every 1 ppm of free chlorine added dichlor will add .9 ppm CYA and triclor will add .6 ppm CYA.

  4. Back To Top    #4

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    Yeah - kinda thought that. I'll be adding some to help it out. Blazing hot sun here right now - so need to help it some.
    Thanks for your response.
    20x40 30,000 gal IG Liner, Pentair II Sand

  5. Back To Top    #5

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    Quote Originally Posted by waterbear
    First a queston, what are di pucks?
    Wow - long day ... didn't mean to say di "pucks" . . .
    20x40 30,000 gal IG Liner, Pentair II Sand

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