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Thread: Lowering Alk in Hot Tub

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    csevel is offline Established User Thread Analyst csevel 0
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    Question Lowering Alk in Hot Tub

    I want to lower my alkalinity in my hot tub...is it safe to add muriatic acid to the spa with the jets bubbling? What is the calculation to lower alk by say...40ppm. How much muriatic acid to use? I saw a calculation somewhere in these threads but I can't find it anymore:
    Claudia
    18' Echo Canyon A/G Pool by Artesian
    8500 gallons
    3/4hp Jacuzzi 2-speed pump - Cartridge Filter

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    waterbear is offline PF Support Team Sniggle Mechanic waterbear 4 stars waterbear 4 stars waterbear 4 stars waterbear 4 stars
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    Default Re: Lowering Alk in Hot Tub

    How many gallons is your hot tub.? It is safe to use muriatic acid but you will be dosing by teaspoons, tablespoons, and ounces and it is very easy to overshoot. Dry acid is easier to measure for the small volumes of water in a hot tub. Procedure is the same as for a pool. Lower the pH to about 7.0 then aereate to decrease TA! The air jets and bubblers (if you have them) make efficient aeration very easy! Here is the thread that explains it
    http://www.poolforum.com/pf2/showthread.php?t=191
    11.75'x23.75' kidney 6.5K gal IG fiberglass pool/300 gal acrylic spillover spa combo; Aqualogic automation/SWCG; Pentair Clean and Clear 150 cart filter; 1.5 hp uprated 2 spd Pentair Whisperflo pump; PF:17
    Retired pool store and commercial pool maintenance guy.

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    csevel is offline Established User Thread Analyst csevel 0
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    Default Re: Lowering Alk in Hot Tub

    It's a 500 gal. tub. The PH is at 7.8 and the alk is at 220. All other numbers look good. How much muriatic acid should I add to lower the alk?
    Claudia
    18' Echo Canyon A/G Pool by Artesian
    8500 gallons
    3/4hp Jacuzzi 2-speed pump - Cartridge Filter

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    waterbear's Avatar
    waterbear is offline PF Support Team Sniggle Mechanic waterbear 4 stars waterbear 4 stars waterbear 4 stars waterbear 4 stars
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    Default Re: Lowering Alk in Hot Tub

    Quote Originally Posted by csevel
    It's a 500 gal. tub. The PH is at 7.8 and the alk is at 220. All other numbers look good. How much muriatic acid should I add to lower the alk?
    I would not add more than 1/2 oz. at a time (1 tablespoon) and then check the pH in about 20 minutes of filter run time. Repeat until the pH is at about 7.0 and then open up the air jets.
    11.75'x23.75' kidney 6.5K gal IG fiberglass pool/300 gal acrylic spillover spa combo; Aqualogic automation/SWCG; Pentair Clean and Clear 150 cart filter; 1.5 hp uprated 2 spd Pentair Whisperflo pump; PF:17
    Retired pool store and commercial pool maintenance guy.

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