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Thread: Muriatic acid concentrations: Heads up, buyer beware, etc

  1. Back To Top    #1

    Join Date
    Jul 2011
    Stockton, CA

    Muriatic acid concentrations: Heads up, buyer beware, etc

    I've been using Kem-Tek muriatic acid for several years. This year they changed the design of the cartons holding two 1 gallon jugs of the stuff. Recently I noticed that after adding acid according to numbers from The Pool Calculator, my pH was still running high. While at a local Home Depot yesterday I looked more carefully at the cartons. All were stored on the same rack, and all were the same price. I was shocked!

    One style Kem-Tek carton, with a generic designation for "pools and spas" showed HCl concentration: 14.5%
    Another style Kem-Tek carton, labelled "Contractor Use" had HCl concentration: 29%
    Another plain brown carton, no manufacturer name apparent, listed HCl: 31.5%!!!

    I believe I have been inadvertently using the watered down 14.5% solution for several months, and am quite sure all the cartons last season had 31.5% concentration. Needless to say, I bought the carton with the 31.5% HCL at the same price. I've not yet spoken to the store manager about this, but plan to do so.

    So, be sure to look at the composition of the chemicals you buy, even if it looks like a product you are familiar with, and have used in the past. Caveat emptor!
    22,500 gal, in-ground, plaster, Intelliflo VS 3050 pump, Sta-Rite 400 sq. ft. cartridge filter, solar panels on roof

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Muriatic acid concentrations: Heads up, buyer beware, e

    I pointed this out to someone in the check out line in front of me at Lowe's a month ago. He had no idea there were different strengths and put it back.
    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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  3. Back To Top    #3
    ColdAirGuy's Avatar
    Join Date
    May 2010

    Re: Muriatic acid concentrations: Heads up, buyer beware, e

    Hmm...I just purchased the case with the new design last week. I have an old box in the garage still...I'm going to compare them. Thanks for the heads up.
    Anthony 16,000 Gallon Oval, White plaster, 30' Long 15' Wide 5 1/2' Deep end 3 1/2' shallow end.
    Pentair Intelliflo, FNS Plus 60sf. DE, Pentair Intellibrite 5G
    TF100 Testkit

  4. Back To Top    #4

    Join Date
    Jul 2013
    Columbus, Ohio

    Re: Muriatic acid concentrations: Heads up, buyer beware, e

    I just ran into the same thing at Home Depot. They are selling a "Green" version of acid that is "safer" to use with less fumes. What they don't tell you is the concentration is reduced. The price is the same however. Go figure.
    16,500 gallon, 18" x 38" Grecian; IG Vinyl, Hayward DE

  5. Back To Top    #5

    Join Date
    Sep 2009
    Greentown, IN

    Re: Muriatic acid concentrations: Heads up, buyer beware, e

    Thanks for the heads up! I haven't noticed any change in the packaging at Menard's where I have always gotten mine, but something to be on the watch for, for sure!
    Indiana, ABG 24'x52" Galveston by Blue Cascade (Craigslist buy w/part of deck included), 13,500 gallons, Intex SWG, solar panels mix 2, TF-100 test kit.

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