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Thread: Issued Developed maintaining PH

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    Issued Developed maintaining PH

    I have followed the dichlor than bleach method on here successfully for a year in my hot tub. I used to have a whole house filtration/antiscale system that still allowed the well water calcium to be at 360 ppm. I used to set my TA at 80, and would hardly ever have to mess with PH. The wife didn't like the filtration system, so we switched back to a water softner. When I refilled the hot tub, of course the calcium was at 0, so I added calcium until 150. No matter where I set TA at now, the PH keeps rising above 8, even during the week when we don't use the tub. I have lowered TA down to 50 and up to a 100, and still have PH rise regardless of jets(aeration) time.

    Any thoughts on this? Do I need to add calcium to mimic well water again?

    Thanks.

  2. Back To Top    #2

    Re: Issued Developed maintaining PH

    If your previous calcium was 360 ppm, then it might be calcium carbonate scale dissolving and raising the pH. If the chlorine is high, it might be a false reading. Try maintaining a lower TA.

    Are there signs of scaling?

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    linen's Avatar
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    Re: Issued Developed maintaining PH

    There should be nothing about the calcium hardness level that would have caused a decrease (or increase) in rate of ph rise in your spa. As you already have, I would continue to look for other potential changes, such as more aeration action due to less blockage in pipes, etc. maybe even when aeration is supposed to be "off". Another thing to help with ph rise is keeping your TA down around 50 ppm and adding 50 ppm of borates.

    How often are you adding makeup water to your spa? What is the makeup water TA and ph?
    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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    linen's Avatar
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    Re: Issued Developed maintaining PH

    I should have asked, what surface is your spa?
    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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    Re: Issued Developed maintaining PH

    Shell is acrylic. Already maintain borates at 40 to 50. No signs of scaling. Haven't tested make up water, but it will be softened water. I can test make up water later.

    Thanks.

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    Re: Issued Developed maintaining PH

    Fill water PH=7.0 to 7.2 and TA=280.

    Thanks.

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    Richard320's Avatar
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    Re: Issued Developed maintaining PH

    Just to be sure... you're not getting those readings with test strips are you?
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  8. Back To Top    #8

    Re: Issued Developed maintaining PH

    No, Taylor drop kit. Borates are test strips.

    Thanks.

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