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Thread: Extremely High pH

  1. Back To Top    #1

    Join Date
    Jul 2011
    Location
    Limerick, PA
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    28

    Extremely High pH

    Hi all,

    I have a less than one year old plaster pool and battled high pH from the beginning - as expected with a plaster pool. Last year's start up with potable water was easy. We closed the pool in early December and just opened it last weekend and got the filter running. pH was off the charts. This is my first opening so to get things going, I brushed down the pool and through the pool cleaner in. The cleaner trapped about 2 pounds worth of calcium crystals Ė which makes some sense given the high pH. I started dumping muriactic (31.5%) acid in slowly, 1qt at a time. Iím now a gallon and a half in and pH is still too high and unmeasureable. Without being able to measure, Iím not really sure how long this could go on and looking for some rough advice based on a 20,000 gallon plaster pool? I would think Iíd have to be close to getting it back in range but really have no frame of reference. Last year's start up from potable water only took two quarts to bring it in to 7.2.

    Also, trying to get my CYA number in line as well. I have a SWG and targeting about 70. I have the TFT kit and if I use that test it shows Iím at 20. Two local pool stores are showing 40 and my neighbors kit shows 50. Test strips (yea, just for giggles) shows me within the highly accurate 30-50 range, which is convenience since thatís what the other three independent tests show. Nothing like accuracy! Since I donít want to over add, which one do I believe? I ordered some new reagent just in case what I have is bad, but thought Iíd ask.

    Numbers.. my chlorine number are low as I just got the salt in but didnít want to start shocking until I got the CYA up a bit and the pH down.

    FC = 0
    CC = have not measured yet
    pH = ??, like a bazillion
    TA = 100
    CH = 250
    CYA = 20

    Lastly, is there a way to keep the pH down during the closed months? Thanks for any advice..
    17x39 Rectangular, 20,000 Gal, Plaster, Pentair Easy Touch Automation and Remote
    Pentair WhisperFlow 2 hp pump with Pentair Clean & Clear Cartridge Filter
    Pentair Master Temp Gas Heater, Pentair IntelliChlor IC-40, Pentair Kreepy Krauly Legend II Cleaner
    ..and one frog that thinks the pool is his.

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Extremely High pH

    I would add acid one half gallon at a time, but otherwise just continue doing what you are doing now. There is a test, the acid demand test, that can determine this kind of thing for you, but you would have to have the special reagent and it hardly ever comes up, so not usually worth keeping the reagent around.

    I'll bet your CYA really is 20. However, when in doubt add too little and fix it later. It is much better to end up a little low than to overshot and end up too high.
    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

  3. Back To Top    #3

    Re: Extremely High pH

    i was in a similar situation a few weeks ago upon opening my pool and it took 3 gallons of 20% MA added 1/2 gal at a time. I was surprised how much it took but I tested an hour after each addition until the pH was in range.
    I'm really new here so make sure you listen to the pros. They will get you all situated.
    30000 gallon inground gunite pool
    Intelliflo ic-60 SWG, pentair tagelus sand filter, 1.5 hp whisperflo pump, tf 100 test kit,
    2 kids(tl), 1 mini-dachshund/lab mix(t),
    Central Illinois

  4. Back To Top    #4

    Join Date
    Jul 2011
    Location
    Limerick, PA
    Posts
    28

    Re: Extremely High pH

    Thanks. I had been testing every 3 hours as my pump (on high) turns the water over in that time frame. Perhaps I should check every hour and speed the process up a bit.
    17x39 Rectangular, 20,000 Gal, Plaster, Pentair Easy Touch Automation and Remote
    Pentair WhisperFlow 2 hp pump with Pentair Clean & Clear Cartridge Filter
    Pentair Master Temp Gas Heater, Pentair IntelliChlor IC-40, Pentair Kreepy Krauly Legend II Cleaner
    ..and one frog that thinks the pool is his.

  5. Back To Top    #5
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Extremely High pH

    Muriatic acid mixes into the water especially quickly. As long as the pump is left running you can retest the PH as quickly as half an hour after adding acid.
    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

  6. Back To Top    #6

    Join Date
    Jul 2011
    Location
    Limerick, PA
    Posts
    28

    Re: Extremely High pH

    Thanks Jason. That's helpful and should move things along.
    17x39 Rectangular, 20,000 Gal, Plaster, Pentair Easy Touch Automation and Remote
    Pentair WhisperFlow 2 hp pump with Pentair Clean & Clear Cartridge Filter
    Pentair Master Temp Gas Heater, Pentair IntelliChlor IC-40, Pentair Kreepy Krauly Legend II Cleaner
    ..and one frog that thinks the pool is his.

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