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Thread: Concerns?

  1. Back To Top    #1

    Join Date
    Oct 2015
    San Diego, Ca.


    What are the concerns by using pH Down by Clorox vs. Muriatic Acid?
    30,000 Gal. - 40x20x8 - Plaster - SWG Pentair IC 60 - Hayward Pheonix 4x Vacuum - Hayward c1750 Cartridge Filter - Hayward 3/4hp pump - Pool is 45 years old.

  2. Back To Top    #2
    JoyfulNoise's Avatar
    Join Date
    May 2015
    Tucson, AZ

    Re: Concerns?

    Dry acid chemicals like "pHDown" are sodium bisulfate. They work the same to lower pH as muriatic acid does, but they add sulfates to your pool water. Every 1lb of sodium bisulfate per 10,000 gallons of pool water will add about 8ppm sulfates. Sulfates above 300ppm can cause damage to plaster known as "sulfate attack" and sulfates are detrimental to the coatings on SWG cell plates.

    Best to stay away from dry acid chemicals.
    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, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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