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Thread: how to measure low pH accurately?

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    Join Date
    Mar 2008
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    Delaware
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    how to measure low pH accurately?

    i'm trying to run my pH in the low 6 range to get rid of the scale, but my taylor test tube only shows a low of 6.8 - does anyone know how i can acurately measure any lower?
    Thank you in advance for your help.

    Noctiss

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    Join Date
    Feb 2008
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    Flower Mound, TX
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    Re: how to measure low pH accurately?

    Keeping your pool water with a pH in this range will cause damage to your plumbing and pool surfaces. This is not a good way to remove your scale. Scale is usually taken care of by draining, followed by an acid wash.
    10K gallon IG gunite with waterfall; Pentair CC320P filter; WhisperFlo 2 HP pump
    TF Test Kits - Pool Math - Pool School
    "It depends."- JohnT

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    Guest

    Re: how to measure low pH accurately?

    I know how but won't say because droping your pH that low will most likely cause damage as 257WbyMag said! NOT the best game plan.

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    Mar 2008
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    Delaware
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    Re: how to measure low pH accurately?

    thanks, i know that it's risky. either way, if it doesn't work, i'm due for a replaster anyhow. and i bypassed the heater (we never use it anyway - had fun cutting and pasting pvc pipes!)

    i'd rather take the risk, given that the reward could be my kids without cut up knees and toes.

    now, back to the topic's question - anyone seen a low measuring pH 'meter'/ testtube?

    i'm off to the gardenshed to find out if my soil pH meter will work in my pool. if not, then i may go hunting at poolstores.
    Thank you in advance for your help.

    Noctiss

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    mas985's Avatar
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    May 2007
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    Pleasanton, CA
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    Re: how to measure low pH accurately?

    If the scale areas are small, a fine grit wet sandpaper works really well.

    However, if you really want to do this with acid while the pool is filled, then perhaps you should follow the instructions for a plaster pool acid start. This is usually done for new plaster pools but I have heard that some use it for just the purpose you are suggesting.

    Here is a procedure you can use. It uses more acid and borax (PH up) than a simple drain and acid wash and be aware that you can damage the surface doing this. So only do this if you really don't care about your pool surface. Also, you should NOT run the equipment during this procedure.

    The goal of an acid start is to get TA to drop to a very low level for only a few days so PH is not all that important to know accurately. TA can be measured at any level but once it drops to 0-5 ppm, there is no point in adding any more acid. The instructions suggest 3.5 gallons per 10000 gallons of water. I have heard of higher acid amounts than that but you should not need more than 5 gallons per 10000 gallons of water. However, it is important that you follow the instructions so as not to damage the surface more than necessary. In your case, the pool may never feel slimy as they suggest so you may have to go by time and not leave it that way for more than a few days.

    This is an experimental procedure for your application so use it at your own risk and take precautions to prevent damage to equipment, surrounding materials, landscaping and the pool surface.
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  6. Back To Top    #6
    Guest

    Re: how to measure low pH accurately?

    and MAKE SURE everyone stays out of the pool!

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