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Thread: New pool owner, pH keeps going up

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    Question New pool owner, pH keeps going up

    I have cut all ties with my pool shop after getting a ton of misleading advice (& unnecessary products!) from my pool shop. Pool shop suggested I use CYA-free shock, as I had 100ppm CYA. I now have high CH with all the cal hypo I've thrown in. I've switched to the TFPC method & I seem to be adding a lot of muriatic acid to keep the pH stable, around 12-15oz / 2days to keep pH @ 7.4-7.6.

    Pool chem results are:

    PH 7.6
    FC 3.0
    CYA 30
    CH 450
    TA 100
    Temp: 92
    Size: 18,000 gal

    Is this a typical amount of acid? Do I have something else wrong?
    18000 gal pebbletech pool+spa, Raypak 400k BTU heater, Pentair VS pump, IntelliTouch, Testing w/ TK2006.

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    Mod Squad YippeeSkippy's Avatar
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    Re: New pool owner, pH keeps going up

    Your CH isn't enormously high....Your TA is a tad high but repeated doses of MA will work on lowering that. But do you have any fountains or other doo-dads that are providing a lot of aeration which causes the pH to rise? As you lower your pH, the TA will lower and after a few weeks it may all stabilize
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
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    DaninFLA's Avatar
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    Re: New pool owner, pH keeps going up

    12-15 ounces every two days isn't bad. that's probably what I add on average and my pool is 1/2 your size. your bigger issue is your CYA, need to lower that. only way to do that is drain/refill. that would solve your CYA issue, your CH issue and also probably reduce your TA some which is making your pH rise
    Dan
    9,000 gallon in-ground Saltwater pool, plaster, cartridge filer, 1.0 hp pump, Hayward T-15 SWCG, TF-100
    Pool School - Chlorine / CYA Chart; Pool School - Test Kits Compared;

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    Re: New pool owner, pH keeps going up

    DaninFla, his CYA is only 30. Level is OK. Are you confusing it with another number?

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    Re: New pool owner, pH keeps going up

    I've been adding 3" pucks to get my CYA up from 20ppm. Rain in Texas took my high CYA from 80 -> 20 just through dilution in Spring. No water bill to fix that

    Should I stop adding the pucks now that CYA 30ppm?
    18000 gal pebbletech pool+spa, Raypak 400k BTU heater, Pentair VS pump, IntelliTouch, Testing w/ TK2006.

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    Re: New pool owner, pH keeps going up

    Welcome to the forum Kemyst. I'm adding about the same amount to my water every 2 days. I have a spillover on the spa, so I'm thinking that's probably the major cause for me. My TA is at 70. As far as I can tell your numbers look great. I wouldn't worry about the CH. Mine is hovering around 700. Just use poolmath to keep your CSI in range.

    Every pool is different, so it may be normal for yours to use 12oz/2 days of MA (I don't think it's completely abnormal anyway).
    14,000 Gal IG Pool/500 Gal Attached Spa
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    DaninFLA's Avatar
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    Re: New pool owner, pH keeps going up

    Quote Originally Posted by 1stand3rd View Post
    DaninFla, his CYA is only 30. Level is OK. Are you confusing it with another number?
    yep. I misread, I see he HAD 100ppm but now its 30ppm. good deal.


    - - - Updated - - -

    Quote Originally Posted by bigglesworth View Post

    Every pool is different, so it may be normal for yours to use 12oz/2 days of MA (I don't think it's completely abnormal anyway).
    totally agree, that amount does not seem overly excessive at all. 12 oz every 2 days means 1 gallon of MA should last about 20 days or so, so 1.5 gallons a month. or $10 worth.

    your TA is a bit high which is causing your pH to rise faster. when you lower your pH, lower it to 7.2, not 7.4, etc. this process of going to 7.2, then raising and lowering again will lower your TA. eventually as your TA goes lower, your pH rise will decrease which will mean less MA being used, and less often
    Dan
    9,000 gallon in-ground Saltwater pool, plaster, cartridge filer, 1.0 hp pump, Hayward T-15 SWCG, TF-100
    Pool School - Chlorine / CYA Chart; Pool School - Test Kits Compared;

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    Re: New pool owner, pH keeps going up

    I've been setting TA to 100 as per pool shop, so that was mistake #1. It will drift lower to 90 with the next rainfall, so mother nature should take care of that one for me. Good to know my muriatic consumption is not crazy. I only needed ~ 3-6oz / 2 days when using cal-hypo, so the 4x increase was concerning. Good thing now is that my chlorine bill is 75% less now I'm on 10% bleach from Home Depot.

    Thanks for the advice
    18000 gal pebbletech pool+spa, Raypak 400k BTU heater, Pentair VS pump, IntelliTouch, Testing w/ TK2006.

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