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Thread: Draining Pool due to high CYA ; Gray moddling on UltraPoz

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    Draining Pool due to high CYA ; Gray moddling on UltraPoz

    Just joined TFP today and am very impressed with the knowledge here. I seem to be a tri-chlor tab victim causing high CYA. I have a CYA of 150 (knowing hard to gauge > 100). I haven't added chlorine in any form for about 6 weeks - water very clear as water temp is 45 degrees . I'm having the pool drained and will be switching to liquid chlorine as much as possible in the coming summer. The question is whether I should have the ultra poz surface acid washed to get it back to the way it looked when new? Is this adviseable?
    17,800 gallons; Cartridge; Pentair whisperflow 2HP pump; UltraPoz surface; Phoenix, AZ

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    linen's Avatar
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    Re: Draining Pool due to high CYA ; Gray moddling on UltraPo

    Welcome to tfp, pcman

    Quote Originally Posted by pcman
    The question is whether I should have the ultra poz surface acid washed to get it back to the way it looked when new? Is this adviseable?
    I would think you could do an acid wash, though I am not familiar with your exact surface. Keep in mind that acid washes can take off scaling, but they also take some plaster too, shortening the overall life of the pool. Hopefully someone will be along soon that can answer you question Posting pictures of the scaling might not be a bad idea.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Draining Pool due to high CYA ; Gray moddling on UltraPo

    No need to drain your entire pool. Just calculate drain to get cYA down around 40 or so. I would suggest a 3/4 drain and go from there.

    The question is whether I should have the ultra poz surface acid washed to get it back to the way it looked when new?
    What does it look like now? If it is bugging you a lot then go ahead and acid wash it with the caveat that linen mentioned above. If it's not bothering you much, leave it alone. adjust your pH TA and CH accordingly and the scale may slowly dissolve.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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