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Thread: After second partial change.

  1. Back To Top    #1

    Join Date
    Jul 2013
    Location
    Columbus, Ohio
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    After second partial change.

    FC=2
    TC=3
    PH=7.6
    TA=100
    CH=225
    CYA=60

    Just finished my second partial water change last night. I have clear water and a small amount of visible algae. I can deal with the algae now that my CYA is finally below 100. It's still too high but I'm done changing water for this season. I put 2 gallons of 12.5% bleach into the water last night just as a starting point. I checked it at lunch and noticed the decrease in chlorine and the algae. I added my last gallon of bleach to hold it until tonight when I can SLAM it.

    The water changes and lot's of acid finally got the CYA, TA and CH down to reasonable numbers from where I was.

    Is there an ideal TA and CH number just for vinyl pools?

    In the past I kept it TA in the 120 - 150 range. I didn't check CH or CYA until I found this site so I don't have a history to fall back on.
    16,500 gallon, 18" x 38" Grecian; IG Vinyl, Hayward DE

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    linen's Avatar
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    Jul 2010
    Location
    Twin Cities, MN
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    Re: After second partial change.

    Your CH is fine for vinyl.

    For TA recommendations, we need to know your planned normal method of chlorinating.
    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.

  3. Back To Top    #3

    Join Date
    Jul 2013
    Location
    Columbus, Ohio
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    114

    Re: After second partial change.

    I was considering a SWG, but for this year I'll probably just stick with 12.5% bleach. I have some cal hypo left over that I will save for emergencies. I'm considering adding Borax and salt to improve the water quality. The goal right now is to get the water quality as good as I can get it.

    Now I just need to find somebody who wants the 100# of pucks that I can't use.
    16,500 gallon, 18" x 38" Grecian; IG Vinyl, Hayward DE

  4. Back To Top    #4
    linen's Avatar
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    Jul 2010
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    Re: After second partial change.

    Okay, if you are going to use bleach then the tfp recommendation is 70-90 ppm for TA. See: http://www.troublefreepool.com/pool-...mmended_levels

    It is not imperative that you actively lower TA. I would recommend just keeping an eye on ph and when it gets up to 7.8 then lower it with Muriatic Acid back down to 7.2. This should slowly lower your TA as you continue to do this over a few cycles.
    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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