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Thread: CYA question.

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    In the Industry

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    CYA question.

    I've heard on numerous occasions that CYA can lead to staining. Is this true? If so, why can it lead to staining?

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    txnole's Avatar
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    Re: CYA question.

    Dumping CYA directly solid/granuals on plaster can stain it; there are several old TFP threads on this. Always use a "sock".
    COMPLETED BUILD THREAD - 15'x29' rectangular offset shotcrete pool; 14,100 gal; 5'x7' raised spa with 400k btu fire feature; 7' spillover; 25' leuder stone raised bond wall w/waterfall; Pentair SWG; Pentair VS (pool); Pentair 3/4hp feature pump; 1hp spa blower; Pentair Cartridge filter; Pentair “Easy Touch 8” wireless; Dolphin Oasis Z5 robot; Solar Hydronics iSwim solar panels; Mansard Screen Enclosure; walnut travertine deck; 1 very happy kiddo.

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    JoyfulNoise's Avatar
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    Re: CYA question.

    Quote Originally Posted by Dz7 View Post
    I've heard on numerous occasions that CYA can lead to staining. Is this true? If so, why can it lead to staining?
    It typically is only seen on fresh plaster when granular CYA is dumped into a pool and allowed to sit on the plaster surface without mixing. If you follow the methods we teach for adding CYA to a pool (the sock method) than it is a non-issue.
    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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    Re: CYA question.

    I have a Wet-Edge Technologies, Lunar Quartz finish in my pool.Basically it's colored plaster with some silica in it that produces pretty colors when the sun strikes it...and is harder, more durable than a typical white plaster finish. Mine is Bermuda Blue. At any rate, within a year of pool startup, I was getting white splotches on the stairs and pool bottom. At the time I was using a chlorine tab feeder and was testing the water about every two weeks at the pool company store....and following their suggestions as to what chems to add to the pool. My analyses always showed a CYA of 100+ and "adjusted" TA's of around 60. I was adding many pounds of their alkalinity + stuff on a regular basis and getting nowhere. After much debate and letters to both the pool company and Wet Edge, they both had their "plaster experts" render opinions based on my water tests.

    Their analyses concluded that the combo of high CYA and low TA creates "aggressive" water that pulls calcium out of the finish and into the water. CH did rise over time. They concluded the resultant "staining" was the calcium being pulled out of the plaster. So, post draining/refilling a bit more than half the pool water, doing a light acid wash, and switching to an SWG system, I now have no further problems. I am also doing my own testing (Taylor K-2006), using TFP Pool Math, and spending a lot less on chemicals.

    My final question to them was, had I just settled for the white plaster pool (white on white), would I have ever noticed the "staining." No response to date.....
    12,000 gallon, in-ground, Lunar Quartz-Bermuda finish. Pentair Intelliflo Pump and Pentair cartridge filer. Polaris 280 pool sweep. Circupool SJ40 SWG.

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