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Thread: pH keeps dropping

  1. Back To Top    #1

    Join Date
    Aug 2010
    Location
    Akron, Ohio
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    pH keeps dropping

    Ok here's a question hopefully someone can help with. I don't know if I have a problem or not.

    I recently found this site and began using borax to raise pH, since I found it was low with my new drop test kit.

    I have added a total of 4 boxes of borax over the last 2 weeks. I added 1 and pH came up to 7.0, so I added another and it went to 7.4. A couple days later the pH went to 7.2, so I added another box and it went back to 7.4. After another couple days it was 7.0, so in went another box.

    Do I have a problem or is this normal. removed my Nature2 cartridge a couple days ago and am adding 12.5% bleach for chlorine.

    I appreciate any help.

    Thanks!
    17000 gallons = 27" round
    Filter = cartridge
    AG (above ground)
    Hayward 1.5HP dual speed pump

  2. Back To Top    #2

    Join Date
    Dec 2009
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    Central Massachusetts
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    2,690

    Re: pH keeps dropping

    Can you post a full set or water test numbers?

    FC
    CC
    TA
    CYA
    CH

    Sounds like the TA might be low, but we really need to see some numbers first before any advise can be given. How have you been chlorinating all season?
    14,000 gallon IG, Vinyl. Hayward 3/4 hp superpump, Penatair IC40 SWCG, Pentair automation, Hayward sand filter, Aqua Comfort heat pump, Hayward 400k Lo-Nox LP heater.

  3. Back To Top    #3
    Mod Squad Bama Rambler's Avatar
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    SouthWest Alabama
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    Re: pH keeps dropping

    As BK says, we need to see some numbers. If your TA is low it'll drive your pH down BUT, we need to see all the numbers before we start making assumptions as to what's going on.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  4. Back To Top    #4

    Join Date
    Aug 2010
    Location
    Akron, Ohio
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    Re: pH keeps dropping

    Ok, I'll run my tests and post later tonight. Hopefully we can get an idea of what's up.

    Thanks!
    17000 gallons = 27" round
    Filter = cartridge
    AG (above ground)
    Hayward 1.5HP dual speed pump

  5. Back To Top    #5

    Join Date
    Aug 2010
    Location
    Akron, Ohio
    Posts
    11

    Re: pH keeps dropping

    Here are my results as of this evening:

    pH = 7.4
    FC = 2
    TA = 90
    CH = 240
    CYA = about 15....Just added 4 lbs a couple days ago. How long should I wait to get an accurate reading?

    Any ideas?
    17000 gallons = 27" round
    Filter = cartridge
    AG (above ground)
    Hayward 1.5HP dual speed pump

  6. Back To Top    #6
    frustratedpoolmom's Avatar
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    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,965

    Re: pH keeps dropping

    Are you keeping the pool covered alot? With a TA at that level and using a solar cover, it's not uncommon to see the PH drift down. Adding CYA will also lower it a little bit.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  7. Back To Top    #7

    Join Date
    Aug 2010
    Location
    Akron, Ohio
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    11

    Re: pH keeps dropping

    The cover is on every night. If it is used during the day the cover does not go back on until the evening usually. Where should TA be? Should I just continue with the borax?
    17000 gallons = 27" round
    Filter = cartridge
    AG (above ground)
    Hayward 1.5HP dual speed pump

  8. Back To Top    #8

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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    Re: pH keeps dropping

    It sounds to me like your pH will stabilize from here on out. I think it took you two additions to get it where you wanted (not uncommon) and then you needed one more to compensate for the addition of CYA.

    Please do not worry about TA. Simply monitor your pH and add borax as needed to maintain where you are. I think you are fine and your adjustments are about complete.

    PS - if pH swings by .2 or so, leave it alone. Do not lower it until it reaches 7.8.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  9. Back To Top    #9

    Join Date
    Aug 2010
    Location
    Akron, Ohio
    Posts
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    Re: pH keeps dropping

    Ok I'll monitor for a couple days and see what is happening. Thanks for all the help.

    BTW, I rigged up a pump / timer to feed bleach each evening and it is working great thus far. If I get the opportunity to snap some pics I will post.

    Thanks again all!
    17000 gallons = 27" round
    Filter = cartridge
    AG (above ground)
    Hayward 1.5HP dual speed pump

  10. Back To Top    #10

    Join Date
    Aug 2010
    Location
    Akron, Ohio
    Posts
    11

    Re: pH keeps dropping

    The pH has leveled at 7.4 as duraleigh said. The pool looks better than ever.

    Thanks for the help!
    17000 gallons = 27" round
    Filter = cartridge
    AG (above ground)
    Hayward 1.5HP dual speed pump

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