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Thread: TA/pH won't increase

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    TA/pH won't increase

    Renting a house with 380 gallon hot tub which was previously maintained by homeowner. Extent of homeowners maintenance consisted of blindly adding bromine tablets and MPS weekly and monthly taking sample to local pool store. Now testing TF 100 and found following parameters:
    1. CH 60
    2. TA 0
    3. pH below 6.8
    4. Br 1

    I used pool math and in attempted to raise TA to 50 by adding 4 oz of baking soda. However TA still reads 0.

    Should I keep adding baking soda or empty hot tub and refill with fresh water and start from scratch?

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: TA/pH won't increase

    Welcome to TFP!

    Continue adding baking soda, running the jets for a little while after each addition. Use enough to raise TA 50 or 60 each time, run the jets for five minutes and recheck the TA and see where you are.

    The water must be very acidic. When the PH is very very low the TA will read zero.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    TFP Guide

    Kiss4aFrog's Avatar
    Join Date
    May 2013
    Hudson, WI

    Re: TA/pH won't increase

    Welcome to the forum MagicMaker

    Do you have any idea of when the last water change was, filter cleaning ?? If it's due anyway now would be the time to dump it and start from scratch.
    32K IG Vinyl, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added. 68
    275gal Conway Emerald Spa, bromine floater, indoor
    TF-100 test kit
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    In the Industry
    Citizen's Avatar
    Join Date
    Oct 2014
    Orlando, FL

    Re: TA/pH won't increase

    Any time I start to get "sluggish" water it is a sign the tub needs to be drained. I would drain it refill and balance it. One product I know that has eased my bothering over PH and TA is Leisure Time's pH Balance Plus. Once you initially balance the spa, add in the Balance plus and then you should be set until the next refill.

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    Join Date
    Sep 2013
    Dallas-Ft. Worth Metroplex, TX

    Re: TA/pH won't increase

    What is "sluggish" water?
    14K Freeform Gunite w/60% Blue Quartz plaster, Quad DE filter, Intelliflo VS Pump + Booster for Cleaner, Aquacal Heat Pump

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