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Thread: Unable to reduce PH value of pool

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    Unable to reduce PH value of pool


    This is my first post to this forum, and hope someone is able to help me with my odd problem.

    It all started with some dark stains in the corners of my pool, that I simply could not get rid of (yes probably accured because of proper maintenance in the first place), even using shock and algee remover did not help, so I was told taht I may be suffering from calcium surface, and the calcium would have imbedded the algee, which is why its impossible to scrub off. So I was adviced to lower the PH value to 6.0 for 3 days, and scrub daily and it should disolve the calcium and I should have the stains removed.. and if I swipe my hand along the side of the pool, I do get white stains on my hand.. I the procedure had begun... However I have hit a wall.. I simply can not get the PH value below 6.5!! I have put about 9 kg (~20 lb) im smaller doses over 2 days, but it does not change the PH Value...

    Im starting to doubt my measiring device as it can simply not be true (using AquaChek), but it seems to be consistant. it reads:
    Clorine: 1
    PH: 6.5
    Alk: 35

    As for what I can read, the Alk is very low, and I should se large change in PH value, but its rock solid at 6.5.

    Any help is much appriciated.

  2. Back To Top    #2

    Re: Unable to reduce PH value of pool

    And forgot to say the pool size is 30.000 liters

    30 (cubic meters) = 1059.44 cubic feet

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

    Re: Unable to reduce PH value of pool

    Can you describe what the stains feel like when your touch them: smooth, slimy, rough? Also what color are they?

    It would also be good if you could post a complete set of test results, notably CH and CYA.

    And, what kind of surface do you have: plaster, pebble, vinyl, fiberglass, etc?
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    SW Indiana

    Re: Unable to reduce PH value of pool

    Welcome to TFP.

    How are you testing your pH? Your kit may bottom out at 6.5, meaning your pH is lower than that.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Unable to reduce PH value of pool

    Yeah, before we go0 too much further, how are you testing below 6.8 pH?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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