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Thread: Help with Cl and pH please!

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    Help with Cl and pH please!

    I have a 44000 gallon non-SWG pool. I've been testing each day to ensure I have enough Cl in there. My TA is at 70 and my Cl is around 8 on average (CYA of 60). I'm finding that no matter how much muriatic acid that I add, I cannot get my pH below 7.8 for any length of time. I know 7.8 is fine, but it's at the top of the range and I would prefer 7.5-7.6 as a landing zone. I have one jet in the deep end that points up and aerates the water and I get normal swimming use. Plaster is a couple of years old, so that's not the source.

    Any thoughts on pH control? Water is clear, but I think that is due to my daily monitoring of Cl levels.

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    Mod Squad JVTrain's Avatar
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    Re: Help with Cl and pH please!

    Is there a reason you have the jet in the deep end aerating all the time? That will drive your pH upward more quickly.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Re: Help with Cl and pH please!

    Quote Originally Posted by JVTrain View Post
    Is there a reason you have the jet in the deep end aerating all the time? That will drive your pH upward more quickly.
    I just moved in a couple of months ago and inherited the pool. That seems to be how it was designed. The other jets go straight out and the one in the deep end is angled up more towards the surface. I assume it's meant to aerate, but I'm just learning about all of this!

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    Mod Squad JVTrain's Avatar
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    Re: Help with Cl and pH please!

    I would angle that return so that it's nearly parallel to the water surface, creating a slight ripple for maximum skimming action without increasing aeration. How many returns do you have?

    It would also help if you filled out your forum signature with more details about your pool. Edit Signature
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Re: Help with Cl and pH please!

    I've got 6 returns. The one in the deep end just has a lot of turbidity at the surface. I'll see about lowering it just a bit.

    Thanks for the suggestion on the signature. Hope that helps!
    45x20 pool: 42000 gallons * AquaBright - Blue Granite finish * bleach chlorination * Pentair Clean and Clear Plus Cartridge Filter * Polaris * Taylor K-2005 C

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