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Thread: Muriatic Acid and Pump Pressure

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    Muriatic Acid and Pump Pressure

    So my TA was up to about 200 at one point this year. I have slowly dropped it by adding MA and then letting PH creep back up then add more MA. It is now down about 90 and am fine with that. But every time I add MA to the pool my pump pressure goes up one the next 24 hours to a point where it needs back washed. I haven't backwashed it just bump the pump and after a couple days of that the pressure stabilizes. Is this normal? Its not a big deal just wondering if this is normal.

    Thanks
    Dan
    Pool - Above Ground 24' Round by 52" Deep
    Filter - Hayward EC40C92S
    Pump - Hayward 1HP Pump
    Test Kit - Taylor K-2006

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    Mod Squad pooldv's Avatar
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    Re: Muriatic Acid and Pump Pressure

    How are you adding the acid? What kind of filter is it?
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    Re: Muriatic Acid and Pump Pressure

    To my knowledge, TA has absolutely nothing to do with increased pressure in your pump.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Muriatic Acid and Pump Pressure

    Im adding the MA to the front of the return in a very small stream into the flow. It is a Hayward DE Filter.

    - - - Updated - - -

    Duraleigh, it is when I add Muriatic Acid that I see a spike in my pressure of my pump over the next 24 hours.
    Pool - Above Ground 24' Round by 52" Deep
    Filter - Hayward EC40C92S
    Pump - Hayward 1HP Pump
    Test Kit - Taylor K-2006

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    JoyfulNoise's Avatar
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    Re: Muriatic Acid and Pump Pressure

    When was the last time you tore down the filter and completely cleaned it out. Your DE fingers could be all "limed up" (scaled with calcium) and in need of cleaning. It's unusual that it's correlated to acid doses as there's really nothing that would cause what you describe.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: Muriatic Acid and Pump Pressure

    It was a brand new pump and filter in May of this year. I have only back washed it 4 times all summer (after finding TFPC). So I have not opened it up this year yet. Was planning on cleaning it at the end of the season before storing for the year.
    Pool - Above Ground 24' Round by 52" Deep
    Filter - Hayward EC40C92S
    Pump - Hayward 1HP Pump
    Test Kit - Taylor K-2006

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    JoyfulNoise's Avatar
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    Re: Muriatic Acid and Pump Pressure

    And when you backwashed, how much DE have you been adding back?
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: Muriatic Acid and Pump Pressure

    4 lbs as directed by the manufacturer in the start up instructions.
    Pool - Above Ground 24' Round by 52" Deep
    Filter - Hayward EC40C92S
    Pump - Hayward 1HP Pump
    Test Kit - Taylor K-2006

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    JoyfulNoise's Avatar
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    Re: Muriatic Acid and Pump Pressure

    Quote Originally Posted by damato300x7 View Post
    4 lbs as directed by the manufacturer in the start up instructions.
    If that's the full charge, then you have likely overcharged the filter with too much DE. Backwashing rarely removes more than 50% of the DE in the filter so doing a full charge each time adds too much DE.

    Mu suggestion is you tear down the filter and clean it all out. It's not hard to do, probably will take an hour or two. It's a perfect Saturday morning project.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: Muriatic Acid and Pump Pressure

    Ok will do. Thanks for the help.
    Pool - Above Ground 24' Round by 52" Deep
    Filter - Hayward EC40C92S
    Pump - Hayward 1HP Pump
    Test Kit - Taylor K-2006

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