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Thread: Some questions on pH

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    Some questions on pH

    First of all, thanks to everyone on this site for the help so far. Although it was a bit frustrating at first, I now feel I have a much better understanding of what's going into my pool and the effects it has and more importantly the effects of NOT having the right chemicals in the pool.

    My questions are in regards to the pH level. When I went through the PB's pool school they gave me a kit that tested for pH very similar to the one in the Taylor kit. My instructions were if it went above 7.8 to add a quart of MA. Well it started at 7.4 and gradually went up but never went above 7.8. After reading this site, but before I got my test kit in I was concerned that I had never added any MA in basically 7 months. However, when my test kit got in and I tested pH, it confirmed 7.8. And that seems to be within range. Up to that point the only thing I had done to the pool was keep the chlorinator filled with pucks.

    Of course my CYA was way high so I had to replace a bunch of water and then I started using only liquid chlorine. pH was 8 after replacing water and I added 32oz of MA. Now I need to add about a quart of MA every 3 days (goes to >8 then it drops to around 7.4 after adding MA). So finally my questions: A) Was there something in the pucks that kept pH fairly stable? From what I read you should expect pH to rise in a new pool. B) Should I be concerned about any of this or just continue on as is adding MA every few days and not worry about it? It seems like now it is acting like it should have when it first opened. C) Does it matter that the MA is 7+ months old? I still have the MA I was given by the PB. It seems to have the expected effect. TA has remained consistently 70 since the refill (it was 80 prior to that)
    - Mike

    19.8K Gallon IG, Pebble finish, Hayward SwimClear Cartridge Filter, Hayward Tristar Dual Speed Pump, DeltaUV D-80 UV Sanitizer, K-2006, Finished August 2016

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    Re: Some questions on pH

    Do you have the specific puck information? The label should indicate what's in them.

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    Mod Squad JohnT's Avatar
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    Re: Some questions on pH

    The pucks are acidic so they push the pH down. Your older MA is fine as long as it is kept closed.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
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    Mod Squad Jimrahbe's Avatar
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    Re: Some questions on pH

    mww,

    If pucks have one good quality it is that they are a little on the acid side and keep pH from increasing as fast.

    I would not worry about having to add acid, but if you want, you can follow this process and lower your TA to 60 and see if that helps slow the increase...

    See this..... https://www.troublefreepool.com/cont...tal-alkalinity

    As long as the MA works, I would not worry about how old it is.

    Thanks for posting,

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Caldera Spa.

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    Re: Some questions on pH

    In addition to the above replies, what is your TA? TA buffers pH similar to CYA/FC. My fill water adds TA and I have to bring it back down so my pH doesn't rise as quickly.

    [Update]
    Jim beat me to it.
    310 gallon Tiger River Sumatran Spa, covered, standalone, fiberglass, Bleach
    11,000 gallon in-ground plaster pool, Hayward SmartFilter 550 (cartridge), CompuPool(Hayward) T-15 SWG, Hayward Super II pump
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    Re: Some questions on pH

    ok thanks everyone for your replies. This helps a lot. I'll keep adding the acid.
    - Mike

    19.8K Gallon IG, Pebble finish, Hayward SwimClear Cartridge Filter, Hayward Tristar Dual Speed Pump, DeltaUV D-80 UV Sanitizer, K-2006, Finished August 2016

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    Re: Some questions on pH

    BTW reading the link on lowering the TA reminded me that I also have a bubbler that runs about 10 hours a day. My wife likes the sound when the bubble is on. So that is probably at least part of the reason for the rising pH.
    - Mike

    19.8K Gallon IG, Pebble finish, Hayward SwimClear Cartridge Filter, Hayward Tristar Dual Speed Pump, DeltaUV D-80 UV Sanitizer, K-2006, Finished August 2016

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