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Thread: High and climbing PH

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    High and climbing PH

    Hey y'all I am trying to figure out why my ph keeps going up. Usually every week my ph gets to 8+. I add MA and get it back down to +- 7.4 and up it goes again.
    The pool looks great and hasn't had any issues since I added the SWG about a month and a half ago.
    Pool is salt 30k gal with a dolphin cleaner.
    Test results are from this morning.

    FC- 6.0 (it was 0 last night because I was out of town, added 1.5 gal bleach and superchlor 13hrs on SWG)
    CC- .5
    PH- 8+
    TA- 140
    CH- 230
    CYA- 80
    No borates

    Do I need to keep adding MA or could it be something else?

    Thanks in advance.
    Taylor FAS DPD test kit. 30k gal salt in-ground plaster pool. CircuPool RJ45. Cartridge Filter.

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    Re: High and climbing PH

    Your pH is climbing because your TA is high. The recommend TA range for a salt water pool is 60-80. I had the same problem with my pool.

    Once your pH climbs to 7.8 or higher, add muriatic acid to bring the pH down to 7.2. Over time, this will lower your TA, and eventually you'll find a TA level where your pH adjustments are minimal. My TA is now at 90 (was over 200), and my pH stays stable at about 7.6.
    20'x40' Oval 27,000 gallon Vinyl IG, Coverstar Auto Cover
    Hayward MaxFlo SP2303VSP, Sta-Rite PLD50 30 sq. ft. DE filter
    Rheem 266,000 btu natural gas heater
    Dolphin Nautilus Plus with Clever Clean
    TF-100 testkit w/ Speed Stir

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    chiefwej's Avatar
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    Re: High and climbing PH

    I had trouble with rising pH. I used MA and aeration to lower the TA (from150 to 60), then added borates (50 ppm). The pH stays stable at 7.4 for a very long time, then one day it's 7.6 and I add a little acid.

    The combination of a lower TA and borates has done wonders.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Patrick_B's Avatar
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    Re: High and climbing PH

    Keep adding, it will come down. It takes a while but it will fall. Is your fill water pH high? If you are aerating a lot that adds to pH rise. Most pools tend to climb in pH. Use the pool calculator and be careful with the acid. You have a ways to go to get your TA down for the SWG. Rember to target 7.4-7.5 on pH, lower when you get back to 7.8.

    Welcome to TFP by the way.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

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    Re: High and climbing PH

    However, once you get the TA low enough to stabilize the pH at a reasonable value, it may not stay there. If your fill water has high TA, then every time you add water, the TA creeps up a bit. With high TA fill water (mine is 340) one just has to get used to the nearly constant addition of MA.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    Re: High and climbing PH

    Thanks for all the quick responses! I will read up on aeration. My fill water is very pool friendly so I don't think that is it. I will keep adding MA until it is down. Thanks again.
    Taylor FAS DPD test kit. 30k gal salt in-ground plaster pool. CircuPool RJ45. Cartridge Filter.

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    Re: High and climbing PH

    Unless you're at risk for scaling (which I don't think you are based on your test results), high TA alone is not a problem. If I were you, I would not bother with aeration. I would just measure pH daily and lower with MA as needed. Eventually your TA will come down and your MA additions will become less frequent. This sort of problem takes care of itself.
    20'x40' Oval 27,000 gallon Vinyl IG, Coverstar Auto Cover
    Hayward MaxFlo SP2303VSP, Sta-Rite PLD50 30 sq. ft. DE filter
    Rheem 266,000 btu natural gas heater
    Dolphin Nautilus Plus with Clever Clean
    TF-100 testkit w/ Speed Stir

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    Re: High and climbing PH

    You can force TA to change by acid & aeration but you get to the same place so much easier just adding MA to lower pH to 7.2 and letting it rise on its own, redoing that when it gets to 7.8 again.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    Patrick_B's Avatar
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    Re: High and climbing PH

    Quote Originally Posted by faby3003
    Unless you're at risk for scaling (which I don't think you are based on your test results), high TA alone is not a problem. If I were you, I would not bother with aeration. I would just measure pH daily and lower with MA as needed. Eventually your TA will come down and your MA additions will become less frequent. This sort of problem takes care of itself.
    But he has a SWG. That changes the game on TA. It must be lower for that type of pool.
    TFP Moderator
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    Re: High and climbing PH

    Quote Originally Posted by Brushpup
    But he has a SWG. That changes the game on TA. It must be lower for that type of pool.
    Yeah, but it will still get there by going slowly. It doesn't have to be done fast. It can be. Just depends on how much you want to mess with the pool. If the aeration is easy to manage, fine. Run that fountain or whatever. But one does not have to rush it or go out and buy or make a bunch of stuff. This one is optional. Just manage the pH and the TA eventually goes down.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    Patrick_B's Avatar
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    Re: High and climbing PH

    Quote Originally Posted by anonapersona
    Quote Originally Posted by Brushpup
    But he has a SWG. That changes the game on TA. It must be lower for that type of pool.
    Yeah, but it will still get there by going slowly. It doesn't have to be done fast. It can be. Just depends on how much you want to mess with the pool. If the aeration is easy to manage, fine. Run that fountain or whatever. But one does not have to rush it or go out and buy or make a bunch of stuff. This one is optional. Just manage the pH and the TA eventually goes down.

    I was strictly speaking about high TA in a SWG pool. I said nothing about rushing to do it or buying anything.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

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    Re: High and climbing PH

    Thanks again for the advice. I am going to start with MA for now. To do the aeration should I use my air compressor with a blow off fitting?
    Taylor FAS DPD test kit. 30k gal salt in-ground plaster pool. CircuPool RJ45. Cartridge Filter.

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    Re: High and climbing PH

    To do the aeration should I use my air compressor with a blow off fitting?
    Others have done just that. It works.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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