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Thread: PH swing in hot tub

  1. Back To Top    #1

    Join Date
    Mar 2015
    Location
    Dallas, Texas
    Posts
    133

    PH swing in hot tub

    Recently switched water in my above ground hot tub 350g. Now I am struggling to keep PH below 8. What gives ? Numbers are the same as before I dumped and I was able to maintain 7.6 with a rise to 7.8ish while in use.

    FC 7
    CC .02
    PH 8
    TA 50
    CH 170


    Build in progress: 31x18 GI (17,336 gallons) / Diamond Brite French Gray finish / Flagstone Coping / 30ft weeping wall with 7 stations plumbed / Salt Finish Deck / Pentair EasyTouch Controls / Pentair IntelliFlo Variable Speed Pump / Pentair D.E. Filter 60sft / Polaris Automatic Pool Sweep w/ Booster Pump.

  2. Back To Top    #2

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: PH swing in hot tub

    Did you have borates in the water before? Do you have more aeration now than before?
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  3. Back To Top    #3

    Join Date
    Mar 2015
    Location
    Dallas, Texas
    Posts
    133

    Re: PH swing in hot tub

    No borate I do the bleach method after getting cya to 20 to 30 range.

    Build in progress: 31x18 GI (17,336 gallons) / Diamond Brite French Gray finish / Flagstone Coping / 30ft weeping wall with 7 stations plumbed / Salt Finish Deck / Pentair EasyTouch Controls / Pentair IntelliFlo Variable Speed Pump / Pentair D.E. Filter 60sft / Polaris Automatic Pool Sweep w/ Booster Pump.

  4. Back To Top    #4

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: PH swing in hot tub

    Well I don't know why there's a difference between last time and this time, but I do know that 50 ppm Borates will help buffer the pH so you can get boric acid from DudaDiesel or from The Chemistry Store.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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