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Thread: pH drift up, how low with TA

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    tedinelkgrove's Avatar
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    pH drift up, how low with TA

    My pH drifts relatively fast, 7.5 to 7.8+ in a day or 2. My TA reading is 90ppm. I have read pool school and it recommends lowering pH (7.0-7.2) to bring down TA to combat drifting pH. How low should I go with TA? I brought pH down Monday night to 7.2, aerating with waterfalls for ~1hr that night. pH this morning was 7.8 already, and TA is 90ppm still. I just lowered pH down to 7.2 again with waterfalls on. After 1 hour pH still at 7.2.

    Is something else causing this? Pool built in 2006.

    CYA=30
    CH=260
    FC=6
    CC=0
    ~15000 gallon inground, plaster pool
    Jandy CL460 Cartridge Filter Tank, Jandy Stealth SHPF 1.5hp pump, Pentair Legend II cleaner
    Leslie's DPD Complete Test Kit, TF Tests FAS-DPD Chlorine Test Kit
    Heliocol solar pool heating (HC-40 x6)

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    Mod Squad JohnT's Avatar
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    Re: pH drift up, how low with TA

    I'd push your pH down to 7 as long as that isn't the lowest value your kit can measure. The alkalinity lower process works best with lower pH.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: pH drift up, how low with TA

    Quote Originally Posted by tedinelkgrove
    My pH drifts relatively fast, 7.5 to 7.8+ in a day or 2. My TA reading is 90ppm. I have read pool school and it recommends lowering pH (7.0-7.2) to bring down TA to combat drifting pH. How low should I go with TA?
    I had to lower my TA down to 50 - 60 to control PH rise, although even at that low level it is not static but drifts up in tandem with my PH. I have to adjust with acid about once/week.

    With your water feature I would think you will be battling PH rise even after lowering TA.

    FWIW,
    Dave
    20K gal IG plaster pool, Manually chlorinated with 6% bleach, 1.5 HP Sta-Rite Dura-Glas II pump, Pentair FNS Plus 48 DE filter, Polaris 280

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    Re: pH drift up, how low with TA

    I live in your city and have the same issue. My TA is around 70 and I have to add 22oz of MA every other day. I've come to accept that that's the way it is. From my research, it may be because of my SWG. Also, to get my TA down, I lowered my ph to 7.0 and it took 4 hours with my waterfall running (which causes a LOT of aeration) to get the PH back to 7.6.

    ps: Another funny similarity is that I also have the same two test kits as you. This is before I found this site and the dope at Leslie's didn't know the difference between the DPD and the FAS-DPD kits, so I bought the cheaper kit.
    ============================================================ ===========================================
    12,000 gal. IG Colorquartz, 1.65hp Sta-Rite with 2-spd motor, 300sf cartridge, SWG, AquaLogic P4, Polaris 280, gas+solar, 6' sheer descent with dedicated pump

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    tedinelkgrove's Avatar
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    Re: pH drift up, how low with TA

    I usually don't use the water feature, in order to keep pH down. But I was following pool school's recommendation of aerating after bring the pH down to 7.2. Maybe I'll just keep the falls off and let the pump do the aerating. My pump creates quite a vortex where the return jets are located. I think 1.5hp was overkill for my 14k gal pool.
    ~15000 gallon inground, plaster pool
    Jandy CL460 Cartridge Filter Tank, Jandy Stealth SHPF 1.5hp pump, Pentair Legend II cleaner
    Leslie's DPD Complete Test Kit, TF Tests FAS-DPD Chlorine Test Kit
    Heliocol solar pool heating (HC-40 x6)

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    tedinelkgrove's Avatar
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    Re: pH drift up, how low with TA

    Bignick, nice to finally see a Sac area person on here. I am sure there are others. I assume the Leslie's you refer to is the one off Laguna Blvd? If so, they are really bad, or play the role. The guy acted like he never heard of CYA and insisted I buy the trichlor. I was in there to get stabilizer after draining, that was it. Anyway, that was the last time I was in there. I've resorted to ordering testing stuff through TFP sponsers/supporters.

    If you use liquid chlorine, where are you getting it locally? I go to Orchard Hardware, $7 for 2 gals of 10% hypochlorite. Wish I could find 12%, but I am not sure it is sold in California.
    ~15000 gallon inground, plaster pool
    Jandy CL460 Cartridge Filter Tank, Jandy Stealth SHPF 1.5hp pump, Pentair Legend II cleaner
    Leslie's DPD Complete Test Kit, TF Tests FAS-DPD Chlorine Test Kit
    Heliocol solar pool heating (HC-40 x6)

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    Re: pH drift up, how low with TA

    Quote Originally Posted by tedinelkgrove
    If you use liquid chlorine, where are you getting it locally? I go to Orchard Hardware, $7 for 2 gals of 10% hypochlorite. Wish I could find 12%, but I am not sure it is sold in California.
    Ted, it is sold in Cal. You might have to call around to find it, though. Here in the Central Valley, almost all the poolstores carry it, even Leslies.

    I buy 12.5% at a local mom and pop store for $15.25 OTD for 4 gals.

    Keep searching, you'll find some.

    C-Ya!! Mike

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    Re: pH drift up, how low with TA

    There are many HASA chlorine dealers in both Northern and Southern California. HASA manufactures and distributes 12% chlorine.

    Here is a link to dealers. http://www.hasapool.com/nca_dealers.htm
    Buggs

    14,000 gallon, in ground, plaster, free form, play pool.
    Sta-Rite Max-E-Glass with a 1.5 hp Emerson motor
    WaterCo Micron High Rate sand filter S750 490 lb, 4883 sq ft - using ZeoBest
    In floor Polaris cleaning system
    Blue Diamond robot for those after storm days when I can't wait overnight for the in floor to clean it.

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    Re: pH drift up, how low with TA

    Quote Originally Posted by tedinelkgrove
    Bignick, nice to finally see a Sac area person on here. I am sure there are others. I assume the Leslie's you refer to is the one off Laguna Blvd? If so, they are really bad, or play the role. The guy acted like he never heard of CYA and insisted I buy the trichlor. I was in there to get stabilizer after draining, that was it. Anyway, that was the last time I was in there. I've resorted to ordering testing stuff through TFP sponsers/supporters.

    If you use liquid chlorine, where are you getting it locally? I go to Orchard Hardware, $7 for 2 gals of 10% hypochlorite. Wish I could find 12%, but I am not sure it is sold in California.
    Yes, the Leslie's on Laguna. I usually go there on the weekend when the cute females are working, but I just buy what I need and don't ask questions. I have an SWG, so I don't buy chlorine. You might check with All Clear Pool on Elk Grove-Florin or the new Sage Pools on W. Stockton Blvd. in the Macaroni Grill parking lot.
    ============================================================ ===========================================
    12,000 gal. IG Colorquartz, 1.65hp Sta-Rite with 2-spd motor, 300sf cartridge, SWG, AquaLogic P4, Polaris 280, gas+solar, 6' sheer descent with dedicated pump

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    tedinelkgrove's Avatar
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    Re: pH drift up, how low with TA

    I found the 12.5% chlorine at Sage Pools. $15.80 for 4 gallons. Good deal.
    ~15000 gallon inground, plaster pool
    Jandy CL460 Cartridge Filter Tank, Jandy Stealth SHPF 1.5hp pump, Pentair Legend II cleaner
    Leslie's DPD Complete Test Kit, TF Tests FAS-DPD Chlorine Test Kit
    Heliocol solar pool heating (HC-40 x6)

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