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Thread: Trouble maintaining PH and Chlorine levels in my hot tub

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    harleysilo's Avatar
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    Trouble maintaining PH and Chlorine levels in my hot tub

    Stand alone hot tub.

    Test Numbers last night

    Chlorine 5 PPM
    CC ~.5 PPM
    TA 100 (finally got it there)
    CYA 40ish
    CH haven't tested it, fiberglass tub, probably 140 like pool
    Borates showing up at 50PPM on the strips

    now you noticed i left out PH

    That's cause i have NO IDEA what it is.

    I am pretty sure it was above 8.2 prior to adding MA, but 1 hour after adding MA i have no idea where it is at. I've tested with my TF-100 kit and my API fish keeping test kit which has separate drops for High PH or Low PH.....

    So prior to adding some MA...



    Afterwords





    Testing with fish tank kit



    So it's either 6.4-6.5 or 7.8 or maybe 7.6....
    18'x43' Sport Pool
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    JasonLion's Avatar
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    PH levels are driven by the TA level in a hot tub. You won't be able to maintain a reasonable PH level until you lower your TA.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    harleysilo's Avatar
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    Okay so CH actually matters in my hot tub, and i actually use the CSI index as an indicator of what TA i need.....I've been wondering why the CSI thingy is there....

    So IF my CH is 140 and my PH is 7.6, then i would require a TA of 60 to have a CSI close to 0. So i follow instructions in sticky to lower TA to 60 (after i double check my CH).

    I RAISED my TA to 100 because that's what i thought it was supposed to be based on what i've read about non salt water pools.....it had been around 40.
    18'x43' Sport Pool
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    harleysilo's Avatar
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    FC 1
    cc .5
    PH 8.2 ?
    CH 30
    TA 100
    CYA 50
    Borates 50

    Fill water is 30 CH

    250 gallon
    100 degrees
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    harleysilo's Avatar
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    So easiest thing to do is drain, adjust CH, then the rest and all will be well vs. trying to get TA down?

    And what sucks is I tossed a half empty bottle of CH cause I have a vinyl pool and "won't ever need it" LOL.
    18'x43' Sport Pool
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    harleysilo's Avatar
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    I could fill with my pool water, but what would 3000 of salt do to my hot tub?
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    linen's Avatar
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    I am not sure why you are so focused on CH at this point? You want to get TA down not CH up. If you have foaming issues, then getting CH up can help. Am I missing something here?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    harleysilo's Avatar
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    Sticky in hot tub forum says I need to raise CH.
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    linen's Avatar
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    Yep, I forgot about that. What is your tub surface?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    JasonLion's Avatar
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    There is no point in trying to balance CSI in a fiberglass hot tub. Fiberglass doesn't really care what the CSI is. You want CH at 100+, and then adjust TA to whatever gets your PH to be stable, which is likely to be below 60.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    harleysilo's Avatar
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    Thanks peeps! I'll drain tonight then! And I'm thinking my tub is really plastic of sorts, not fiberglass, cause ther is one nick in it and I see no fibers. But I'm guessing plastic doesnt care about CSI either.
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    linen's Avatar
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    Why are you draining?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    harleysilo's Avatar
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    Would replacing 250 gallons be easier than fighting my now elevated TA? That is the question....
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    frustratedpoolmom's Avatar
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    Your TA isn't that bad. I don't see the need to drain at all.

    Edit: Every time the PH hits 7.8, lower it with muratic acid to hit 7.2. It's not that tedious or problematic - I wouldn't bother draining... Just sayin.
    Helpful links: Pool School; CYA/Chlorine Chart
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    linen's Avatar
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    And it should be easy to aerate in the spa. I can move my TA real fast down (as in an of hour with the air vents open on the jets) then dose down with MA and repeat...

    I think I am understanding better now what you are doing, let me see if I get this right. You are going to pump your pool water into your tub? Primarily to get CH up? By the way, in the summer I do that in my tub, not because of CH (my fill is always around 300 ppm), but because I already have it "balanced" and borated.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    harleysilo's Avatar
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    Okay well that was easy, got Ca up to 110 and then got TA down to 60 with a ph of 7.2 in about 30 mins. Hopefully this will fix or help ph rise, thanks everyone. **** shark just sprayed me while I'm typing this time to adjust his tail
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    harleysilo's Avatar
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    Okay so PH rose back up to+8.2. I guess I'll lower it again with MA.....
    18'x43' Sport Pool
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    When your TA is low, then stop the aeration and see if the pH is more stable. Once you've got a low TA with a reasonably stable pH, you can use 50 ppm Borates which will add more pH buffering so should slow down the rate of rise even more.
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    harleysilo's Avatar
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    TA is still at 60, I added borates to 50 about two weeks ago when I did my pool, that might be part of the issue.
    18'x43' Sport Pool
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    Re: Trouble maintaining PH and Chlorine levels in my hot tub

    It's odd for the pH to rise so quickly unless there's a lot of aeration. Do you have an ozonator for the spa? Or is there a spillover?
    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
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