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Thread: Power pool cover and Alkalinity and Ph

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    Power pool cover and Alkalinity and Ph

    I just found this site and wondered if anyone knows anything about power pool covers raising ph.
    My pool store is telling me that not opening my pool cover enough, is causing my ph to go up.
    If this is true, is there a way to avoid this problem?
    Thanks
    13,500 gallon Florida Gem Inground, Hayward EC-75 DE Filter, Prozone PZ7-2HO Ozone Injection System (up to 40,000 Gallons), Auto-Pilot Digital SC-48 (up to 40,000 Gallons), 334 SQ FT Solar Heat with Automatic Temp Control

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    JasonLion's Avatar
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    Re: Power pool cover and Alkalinity and Ph

    It is usually the other way around, putting on a cover can often help slow the rate of PH increases.

    If you post a full set of water test numbers we can probably figure out what is going on.
    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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    Guest

    Re: Power pool cover and Alkalinity and Ph

    my bet is high TA

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    Re: Power pool cover and Alkalinity and Ph

    My ta was around 330 or above, when my ph went up. I lowered my ta to what looks to me, using drops and also a test strip, to about 240. Yesterday I had the pool store test a sample, they use a strip and a machine, they said my ta was now (92 - adj 60) and that this could cause equipment corrosion, sufface damage, and cause swimmers discomfort. They recommend adj ta of 125-150.
    13,500 gallon Florida Gem Inground, Hayward EC-75 DE Filter, Prozone PZ7-2HO Ozone Injection System (up to 40,000 Gallons), Auto-Pilot Digital SC-48 (up to 40,000 Gallons), 334 SQ FT Solar Heat with Automatic Temp Control

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    Re: Power pool cover and Alkalinity and Ph

    To be able to give you the correct help you need, you need to post a FULL set of numbers:
    FC
    CC
    TC
    PH
    TA
    CYA

    And what type of pool you have, how many gallons ETC.
    27' Round AG, 17,200 gallons, sand filter

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    Re: Power pool cover and Alkalinity and Ph

    Here they are

    FC 4
    TC 4
    PH 7.5
    TA 220
    CYA 100

    My pool is 16X32 inground vinyl with about 17000 gals.
    Since the problem with the ph I have added 3 gals of muriatic acid, half a gal at a time, while adjusting the ph.
    13,500 gallon Florida Gem Inground, Hayward EC-75 DE Filter, Prozone PZ7-2HO Ozone Injection System (up to 40,000 Gallons), Auto-Pilot Digital SC-48 (up to 40,000 Gallons), 334 SQ FT Solar Heat with Automatic Temp Control

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    JasonLion's Avatar
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    Re: Power pool cover and Alkalinity and Ph

    Your TA is very high. That is going to cause the PH to constantly drift up. You should lower your TA level, there are directions on doing that here.

    Your CYA level is also very 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

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    Re: Power pool cover and Alkalinity and Ph

    I'm just worried about the difference in the ta tests I do vs the pool stores.
    13,500 gallon Florida Gem Inground, Hayward EC-75 DE Filter, Prozone PZ7-2HO Ozone Injection System (up to 40,000 Gallons), Auto-Pilot Digital SC-48 (up to 40,000 Gallons), 334 SQ FT Solar Heat with Automatic Temp Control

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    frustratedpoolmom's Avatar
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    Re: Power pool cover and Alkalinity and Ph

    Quote Originally Posted by mlulm
    My ta was around 330 or above, when my ph went up. I lowered my ta to what looks to me, using drops and also a test strip, to about 240. Yesterday I had the pool store test a sample, they use a strip and a machine, they said my ta was now (92 - adj 60) and that this could cause equipment corrosion, sufface damage, and cause swimmers discomfort. They recommend adj ta of 125-150.
    Hi there! Don't you love pool stores?

    Even if their test is accurate, and I trust my own testing over theirs any day.... a TA of 92 is not going to cause equipment corrosion or anything else, there are several things that come into play chemistry wise for that to happen but a TA of 90 isn't going to do it...A TA of 90 is perfectly fine. And actually, there are lots of members on here that have TA lower then that in order to prevent PH rise. I'm surprised they recommend a TA of 150, I think that's high.

    What kind of test kit are you using, you mentioned drops and strips. I'm curious of the type of drop kit you have?
    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
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    JasonLion's Avatar
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    Re: Power pool cover and Alkalinity and Ph

    Test strips, including test strips read by an electronic reader, are amazingly unreliable. Drop test results are much better.
    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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    Re: Power pool cover and Alkalinity and Ph

    I used
    1. bioguard drops which showed around 230
    2. auquachek 7 was between 180 and 240
    3. walmarts kit which was easiest to read showed 220

    I'm going to order a good kit.
    13,500 gallon Florida Gem Inground, Hayward EC-75 DE Filter, Prozone PZ7-2HO Ozone Injection System (up to 40,000 Gallons), Auto-Pilot Digital SC-48 (up to 40,000 Gallons), 334 SQ FT Solar Heat with Automatic Temp Control

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    Guest

    Re: Power pool cover and Alkalinity and Ph

    Quote Originally Posted by mlulm
    My ta was around 330 or above, when my ph went up. I lowered my ta to what looks to me, using drops and also a test strip, to about 240. Yesterday I had the pool store test a sample, they use a strip and a machine, they said my ta was now (92 - adj 60) and that this could cause equipment corrosion, sufface damage, and cause swimmers discomfort. They recommend adj ta of 125-150.
    Where you put the TA depends on whether you are using an acidic sanitation source (stabilized chlorine or a bromine systen and/ or MPS for shocking) or not. Many pool store employees and even maintenace techs and pool builders do NOT understand this very simple bit of pool chemistry which is taught in every CPO (commercial pool operators ) course and even a lot of CPOs fail to grasp this simple concept. If you are using bleach you want your TA at about 70-80 ppm. If you are using trichlor you ant it about 100-120 ppm. Low TA has no impact on equipment corrosion. The danger of corrosion comes from low pH which can happen when using trichor or other acidic sanitation sources and not monitoring TA (and pH). The TA gets 'used up' and the pH 'crashes'.

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    Re: Power pool cover and Alkalinity and Ph

    I'm just now changing to the BBB system. I was using a lithium chlorine from the pool store.
    thanks
    13,500 gallon Florida Gem Inground, Hayward EC-75 DE Filter, Prozone PZ7-2HO Ozone Injection System (up to 40,000 Gallons), Auto-Pilot Digital SC-48 (up to 40,000 Gallons), 334 SQ FT Solar Heat with Automatic Temp Control

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    Guest

    Re: Power pool cover and Alkalinity and Ph

    Quote Originally Posted by mlulm
    I'm just now changing to the BBB system. I was using a lithium chlorine from the pool store.
    thanks
    Lithium hypochlorite is a very expen$ive unstabilized chlorine. Other than the price it is an excellent choice. It also requires a low TA like bleach for pH stability.

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    Re: Power pool cover and Alkalinity and Ph

    I was wrong I was using a stabilized chlorine. The Lithium hypochlorite was for shocking.

    So what I got from this is.
    The pool stores ta test isn't accuate.
    The reason my ph went up when I left my pool cover on was because my ta was above 300, not due to the cover.
    Thanks
    13,500 gallon Florida Gem Inground, Hayward EC-75 DE Filter, Prozone PZ7-2HO Ozone Injection System (up to 40,000 Gallons), Auto-Pilot Digital SC-48 (up to 40,000 Gallons), 334 SQ FT Solar Heat with Automatic Temp Control

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    Re: Power pool cover and Alkalinity and Ph

    Do you know of any guildlines for how often and long you should have your pool cover open.
    I'm interested in this because of vacations.
    Thanks
    13,500 gallon Florida Gem Inground, Hayward EC-75 DE Filter, Prozone PZ7-2HO Ozone Injection System (up to 40,000 Gallons), Auto-Pilot Digital SC-48 (up to 40,000 Gallons), 334 SQ FT Solar Heat with Automatic Temp Control

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    frustratedpoolmom's Avatar
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    Re: Power pool cover and Alkalinity and Ph

    Quote Originally Posted by mlulm
    Do you know of any guildlines for how often and long you should have your pool cover open.
    I'm interested in this because of vacations.
    Thanks
    I've left my cover on for 11 days with no problems, shocked before I left and had a friend add a jug of bleach while I was gone, mid week.
    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

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    Butterfly's Avatar
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    Re: Power pool cover and Alkalinity and Ph

    Quote Originally Posted by mlulm
    Do you know of any guildlines for how often and long you should have your pool cover open.
    I'm interested in this because of vacations.
    Thanks
    Hi mlulm,

    If you do a site search for +cover +breathe you will find several threads. Here's one: solar-cover-on-all-the-time-t4204.html?hilit=%20cover%20breathe

    hth
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