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Thread: PH Rise in Pool

  1. Back To Top    #1

    Join Date
    Jul 2014
    The Woodlands, TX

    PH Rise in Pool

    My pool is about 8 months old and i constantly find my PH rising. I live in Houston, TX and the outside Temps are about 95 -100. I feel like my numbers are all in line but don't really know why it doesn't seem to want to stabilize. I thought it would stabilize by now as i would like to keep the PH in the range around 7.2 and 7.4 for my CSI to be balanced. I can get it there by adding acid but then it seems to drift up in the next day or two. I am using liquid chlorine and not chlorine pucks. I do have a waterfall which i never run and i do have a hot tub which has a spillover into the pool which i thought may be contributing to this PH rise due to aeration. I have a good Taylor K-2006c test kit and test CL and PH every day in the evenings. Any advise or tips would be greatly appreciated.

    CL 1.5
    PH 7.7
    AK 80
    CH 300
    CYA 35
    Outside Temp 98
    Pool Temp 94
    Pebblesheen Pool
    Nov 2014 - 25,000 IG Freeform 3.5'-7' w/ 18" Spa, 7 Ton Rock Waterfall, Bordeaux PebbleSheen, UV & Corona Discharge Ozone, HC-3315 Chlorinator, Jandy CV580 Cartridge Filter, Jandy LXI 400K Heater, Polaris 280 Cleaner, Jandy LED Pool2 & Spa1, AquaLink PDA
    Jandy JEP2.0VS (Filter), Jandy SHPM2.5 (Spa), Jandy FHPM1.5 (Waterfall), Polaris PB4-60 (Booster) - 2006C

  2. Back To Top    #2

    Join Date
    Aug 2013
    Arab, Alabama

    Re: PH Rise in Pool

    I think it can take a year or better for your pH to stabilize in a new gunite pool. I would also recommend that you get your FC up as it is too low for your CYA.

    At a CYA of 40 you should target a FC of 5 and never let it drop below 3.
    39YO 13K gallon former SWAMP/MONEY PIT, concrete bottom/Fiberglass Walls, Ecotech VS pump, Hayward Sand Filter, Dolphin DX5 Plus, Loop-Loc safety cover and YES, I have a TFT-100 test kit!

    Shock Level and Maintain - Procedure

  3. Back To Top    #3
    Mod Squad
    Join Date
    Aug 2012
    DFW, TX

    Re: PH Rise in Pool

    Yes, it will take a year or longer for the plaster to cure and PH to stop rising. Change the CH and TA target numbers in poolmath to see if lowering TA or raising CH will help the csi. I just.played around in poolmath and you are fine with ph at 7.7. Just keep lowering ph to 7.2 when it gets to 7.8 by adding muriatic acid. This will slowly lower your TA and help reach equilibrium.

    Use the Pool School - Chlorine / CYA Chart to set your chlorine level.

    More on chlorinating your pool here, Pool School - ABCs of Pool Water Chemistry
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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