+ Reply to Thread
Results 1 to 4 of 4

Thread: Lowering Alk in Hot Tub

  1. #1
    csevel is offline Registered+ Thread Analyst csevel 0
    Join Date
    Mar 2006
    Location
    Cleveland, OH
    Posts
    65

    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

  2. #2
    waterbear's Avatar
    waterbear is offline Lifetime Member Sniggle Mechanic waterbear 4 stars waterbear 4 stars waterbear 4 stars waterbear 4 stars
    Join Date
    Nov 2004
    Location
    St. Augustine, Fl
    Age
    70
    Posts
    3,743

    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
    Retired pool store and commercial pool maintenance guy.

  3. #3
    csevel is offline Registered+ Thread Analyst csevel 0
    Join Date
    Mar 2006
    Location
    Cleveland, OH
    Posts
    65

    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

  4. #4
    waterbear's Avatar
    waterbear is offline Lifetime Member Sniggle Mechanic waterbear 4 stars waterbear 4 stars waterbear 4 stars waterbear 4 stars
    Join Date
    Nov 2004
    Location
    St. Augustine, Fl
    Age
    70
    Posts
    3,743

    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.
    Retired pool store and commercial pool maintenance guy.

+ Reply to Thread

Similar Threads

  1. Lowering TA.
    By DennyB65 in forum Testing and Adjusting Pool Water Chemistry
    Replies: 9
    Last Post: 07-16-2011, 12:03 PM
  2. Lowering CYA
    By jrsdws in forum Pool Startup, Shutdown, & Winter Operation
    Replies: 13
    Last Post: 05-21-2011, 04:39 PM
  3. Lowering pH with CO2
    By Jakebear in forum The China Shop
    Replies: 11
    Last Post: 09-12-2006, 12:21 AM
  4. Lowering Alk
    By Simmons99 in forum Dealing with Alkalinity and Calcium
    Replies: 1
    Last Post: 08-29-2006, 05:21 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts