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Thread: Can't get pH right!

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    Join Date
    Apr 2009
    Location
    SC
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    26

    Can't get pH right!

    Please help!!! My pool is a green mess at present . Two weeks ago, it was gorgeous. Then, it rained very heavy every day for two weeks here in SC. Now my pool is a swamp. I haven't put in any bleach because I can't get the pH below 8.8 ( this is by testing with my TFT kit as well as the local pool store). I have put in a total of 30 lbs of pH reducer (from Leslie's), 5 gallons of muriatic acid and yet the pH stays high! I haven't added bleach because theoretically it won't work at this high ph. Before the rain, there was no organic matter on the bottom (I can't see the bottom at present). My current numbers are:

    pH greater than 8.8 ( by the pool store and off the scale with my TFT Kit)
    FC = 0
    TA = 113 (store numbers say corrected to 95)
    CYA = 60
    Pool is in-ground, vinyl-lined and 43,500 gallons. Pump is a Heyward 1.5hp and I have a Hayward 500 lb sand filter (seems to be in good working order) that runs 24/7.

    My salt generator isn't working, so I've been using 12% Sodium Hypochlorite till now. Any and all help will be greatly appreciated. By the way, I recently had a skimmer line replaced as it was clogged - I added this as the only thing that I have done so I can give as much information as possible. Thanks again!

    Bigdog12
    43,500 gal/Heyward 240 sand filter w/ 1hp pump/In-Ground pool/vinyl liner/Jandy SWG

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    Charlie_R's Avatar
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    May 2013
    Location
    Mexico, MO
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    2,156

    Re: Can't get pH right!

    The possibility does exist that even the pool store's test was maxed out. You pool could be even higher than that. All you really can do is keep pouring the MA to it, per http://www.poolcalculator.com/, and test/dose as often as you can, giving at least an hour between test/dose cycles, until you see a change.
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

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    Re: Can't get pH right!

    I'm thinking that there must be some mistake being made somewhere. 30 pounds of dry acid and 5 gallons of muriatic acid and your pH is still way over 8? How would your pH suddenly get so high? Are you sure that you used dry acid and full strength muriatic acid?

    What was your TA before adding all of the acid?

    What is the pH and TA of your fill water?

  4. Back To Top    #4
    linen's Avatar
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    Jul 2010
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    Twin Cities, MN
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    8,649

    Re: Can't get pH right!

    Have you purposefully added Borates?
    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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    duraleigh's Avatar
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    Re: Can't get pH right!

    I'm with JamesW....something doesn't add up.

    How do you think it got that high in the first place?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  6. Back To Top    #6

    Join Date
    Apr 2009
    Location
    SC
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    Re: Can't get pH right!

    I really have no idea how the pH got so high. To my knowledge, no borates were added. Water comes from a well with a pH of 6.8. It has rained a lot over the past month here in SC (avg 1.5 in/day). I did add sodium bicarb as I have done a lot of backwasing to keep the pool level down. I added sodium bicarb to get the TA up from 40 to 95. Any suggestions will be really appreciated!
    43,500 gal/Heyward 240 sand filter w/ 1hp pump/In-Ground pool/vinyl liner/Jandy SWG

  7. Back To Top    #7

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    Re: Can't get pH right!

    pH just doesn't jump like that on it's own. I suggest you get a new complete pH test kit. The under $10.00 ones are fine for this purpose.

    I sure would not add any more acid at this point.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  8. Back To Top    #8

    Re: Can't get pH right!

    How much sodium bicarb did you add? Are you sure that it wasn't sodium carbonate?

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