TA level

[calstar]

I believe pH will rise if TA is a bit too high and lower if too low, right? My TA is 100, pH creeps up from 7.3 to 7.6 over a couple of days, trying to get it more stable to so I'll try dropping TA to 90, I'll post results but I think this will do it. I drop TA with muriatic acid and aerate to raise pH. I'm shooting to lower TA to 6.9 prior to aerating, or maybe 6.8 to get to 90 TA before aerating. Suggestions/thoughts welcome.

thanks, Brian

FC 5
pH see above
TA 100
CH 500 (super hard water here, manage by keeping CSI at or below 0)
CYA 30
CSI .19 with pH 7.5, -.11 with pH 7.3

 

[mknauss]

As you are using TA and pH to manage your CSI, as I do, you should just do the following - Pool School - Lower Total Alkalinity

Dedicate an afternoon and you can typically get it done. Need some way to aerate. But if you can get a pretty aggressive aeration going, it goes really fast.

Take care.

 

[RadEngr70]

Alkalinity is the ability of your water to buffer acidic inputs. High TA will cause your pH to drift higher, especially if there is aeration of the water through water features, spa jets, etc. Low TA will not cause your pH to rise, and in cases where you have acidic inputs into your water, allow your pool pH to drift lower.

This is why most here will tell you to treat your high pH with muriatic acid as needed, which will also lower your TA, until frequent adjustments for high pH aren't needed as frequently - as opposed to chasing some "perfect" TA number.

 

[Richard320]

I wouldn't bother. Just lower pH to 7.2 whenever it hits 7.8 and TA will come down. Also note that whenever you add topoff water, you're raising TA again most likely. A quick TA test on your fill water will answer that one for you. For me, 2" of added water means a quart of acid. Yours will no doubt be different, but if you pay close attention you'll eventually discover the Exact ratio.