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Thread: Help! My PH is low

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    Join Date
    May 2008
    Location
    Gardner, Kansas
    Posts
    13

    Help! My PH is low

    We just opened the pool and the PH is reading 6.8 and no chlorine. This is only the second summer for the pool and I didn't have this problem last summer. It is an L-shaped 40,000 gallon pool. I am taking a sample to the pool store but how many chemicals am I gonna need and the kids want to know how long til they can swim??
    40X16X24 L-Shaped Inground Pool
    Vinyl Lined
    Sand filter

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    Join Date
    May 2007
    Location
    Round Rock, TX
    Posts
    529
    Borax can be used to raise the PH. I buy it at WalMart in the laundry isle. It is plan 20 Mule Team Borax.

    You should get your water tested and post a complete set of numbers, then we can help you more.

    I would suggest you get the water tested, post them, then go buy what you need.

    Additionally you'll want to get a good testkit. The TF-100 or the Taylor K-2006 are good kits.

    P.S. - Welcome to the forum, and ask lots of questions. Pictures are always nice too.
    15,500 gal, inground gunite pool with 7 ft spa, 2 speed pump 2hp/.33hp, 3/4 hp booster pump, Intermatic P1353 timer, AutoPilot SC-48, Sand filter with ZeoBest, Heater, that I never use . . .

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    whoozer's Avatar
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    Apr 2008
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    Acton Maine
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    633
    Whenever posting balance questions always post numbers....numbers....numbers. This always help the experts give you the most knowledgable advice possible. A good test kit is worth its weight in gold but if you don't have one yet get them done at a pool store without buying any chemicals. Ask lots of questions and I'm sure TFP can help you get your pool sparkling
    14x33 fiberglass freeform
    Variable speed Pentair intelliflo superpump
    420 Clean and Clear Plus cartridge filter.
    pool-school/pool_calculator , http://www.tftestkits.net/

  4. Back To Top    #4

    Join Date
    May 2008
    Location
    Gardner, Kansas
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    13
    Okay, I am back from the pool store.

    Here are the numbers

    TDS 600
    CYA 70
    Total Chlorine 0
    Free Chlorine 0
    PH 6.5
    Total Alkalinity 50
    Adj total Alk 29
    Total Hardness 200
    40X16X24 L-Shaped Inground Pool
    Vinyl Lined
    Sand filter

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084
    Quote Originally Posted by shelton236
    Okay, I am back from the pool store.

    Here are the numbers

    TDS 600
    CYA 70
    Total Chlorine 0
    Free Chlorine 0
    PH 6.5
    Total Alkalinity 50
    Adj total Alk 29
    Total Hardness 200
    Your pH is to low and must be brought up to 7.2 - 7.6 with 20 mule team borax.....sooner rather than later.

    Put some bleach (chlorine) in your pool. Start with three large jugs. How does your water look now? That'll determine the answer to how long before the kids can swim.

    Welcome to the forum.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  6. Back To Top    #6
    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    37,879
    If you have been using trichlor tablets it is easy to get into this kind of situation. Trichlor is acidic and it will lower the TA and PH steadily. You need to be constantly raising PH and occasionally raising TA to compensate.

    Trichlor also raises the CYA level. Eventually CYA gets too high and you start to have problems. You are already at 70, and 80 is the highest you should ever let CYA get. Fairly soon you will either need to stop using trichlor or replace a lot of your water to get the CYA level down.
    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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