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Thread: Muriatic Acid usage?

  1. Back To Top    #1

    Join Date
    Oct 2015
    Location
    San Diego, Ca.
    Posts
    535

    Muriatic Acid usage?

    My water is:
    FC 8.0
    pH 7.8
    TA 80
    CH 230
    CYA 60
    Salt 3400

    I have a Pentair SWG 60 running at 100% for 15 hours per day to maintain the FC. The pool is 30,000 gal.

    Question..... How much 31% Muriatic Acid do you think I should be going through per week or month?

    Thanks
    35,000 Gal. - 40x20x8 - Plaster - SWG Pentair IC 60 - Barracuda G3 Vacuum - Hayward c1750 Cartridge Filter - Blue Torrent VS 1.5hp pump - Pool is 45 years old.

    "I'd build a deck over my pool if I didn't have a SWG"

  2. Back To Top    #2
    robdac's Avatar
    Join Date
    Jun 2014
    Location
    Weston, FL
    Posts
    232

    Re: Muriatic Acid usage?

    My pool is about 1/3 the size of yours and I've used about 3 quarts in 2 months. So, maybe around a gallon a month?
    11K gal IG screened-in plaster pool w/ spa
    pentair 150 cartridge filter, Pentair Intelliflow VS pump,
    Aquarite AQR15 SWG, AquaCal Heatwave Heat Pump, TF-100 test kit

  3. Back To Top    #3
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Muriatic Acid usage?

    That is kind of an excessive amount of SWG run time. That equates to adding 5ppm of FC to the pool daily. The norm is 2-3ppm. Raising the CYA up to around 80ppm would help some and keeping the FC lower according to the FC/CYA Chart would help too.

    But, how does the water look? Have you ever Performed the Overnight Chlorine Loss Test to ensure there is nothing growing in the water?

    If you can reduce the SWG output, and let the TA get lower, that would reduce the speed at which the pH rises and thus lower the amount of acid needed.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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