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Thread: Low TA Question - Maintaining pH at constant level

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    Low TA Question - Maintaining pH at constant level

    My stenner pump coupled with my pH Sense & Dispense system is excellent at keeping pH at a constant 7.5 always...

    The pool levels are as below - This has been pretty much the same for the last several months.

    FC - 5

    CC - 0
    TC - 5

    pH - 7.5
    TA - 40 <- issue?
    CH - 325
    CYA - 50

    The only variable has been TA. This has been slowly going down from 60-70 and is now around 40.
    Is it time to bring the TA up to 60 by adding baking soda? --- Or should I just leave it as it is now?

    There are no problems with the water.
    TIA
    2015 build (link)| 16.5 K gal | Salt Water | IG rect | 35'x16' | 568 sf | 105 ft peri | depth 3'-5' | PV3 in-floor | 2 Venturi skimmers | MDX+SDX drains | T-CELL-15 SWG | Hayward Ecostar VS pump | Hayward 7220 DE Filter | Aqua Cal Icebreaker Heat / Cool pump SQ166 | Hayward Sense & Dispense PH Controller| Omnilogic | Pebble Sheen Blue Surf | Ultra UV | Stenner acid pump | Coverstar Automatic | TF-100

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    Mod Squad pooldv's Avatar
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    Re: Low TA Question - Maintaining pH at constant level

    I would probably bump it up to 50 and see how your PH behaves. 40 is a tad too low. About how much MA is it adding per week/month? Maybe set it to keep PH at 7.6 or 7.7.
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    Re: Low TA Question - Maintaining pH at constant level

    Quote Originally Posted by pooldv View Post
    I would probably bump it up to 50 and see how your PH behaves. 40 is a tad too low. About how much MA is it adding per week/month? Maybe set it to keep PH at 7.6 or 7.7.
    Thanks.. yes, I will bump it up to 50 using pool math values..
    I am requiring about 1.5 gallons of MA per month .. not sure if that is a lot or normal. I read somewhere that the ORP probe requires the pH to be 7.5 constant. Anything above/below 7.5 makes the ORP values swing wildly and the chlorinator kicks in ..

    By trial/error I have it now stabilized so that ORP values around 650 maintains a constant 5 FC with pH @7.5
    2015 build (link)| 16.5 K gal | Salt Water | IG rect | 35'x16' | 568 sf | 105 ft peri | depth 3'-5' | PV3 in-floor | 2 Venturi skimmers | MDX+SDX drains | T-CELL-15 SWG | Hayward Ecostar VS pump | Hayward 7220 DE Filter | Aqua Cal Icebreaker Heat / Cool pump SQ166 | Hayward Sense & Dispense PH Controller| Omnilogic | Pebble Sheen Blue Surf | Ultra UV | Stenner acid pump | Coverstar Automatic | TF-100

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    Mod Squad pooldv's Avatar
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    Re: Low TA Question - Maintaining pH at constant level

    Sounds good! Don't mess with success. Adding a little baking soda occasionally to raise TA is no big deal at all. Nice work!
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    Re: Low TA Question - Maintaining pH at constant level

    Any recommended methods to add baking soda? I am using my Arm and Hammer Kitchen stuff... Planning on mixing with water and adding to skimmer.
    Edit: Never mind. Read about this in pool school ... Going to sprinkle this in the surface of deep end.

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