Needing to add acid every week


Bronze Supporter
May 25, 2018
Following are my readings:
FC - 5 ppm
pH - 8.2
cya - 30
TA - 70

every week I add acid to bring pH down to 7.2 (use pool math) - by the end of the week the pH again drifts back up to 8.2 - what am I doing wrong - how do I get it to stabilize?

PS: we have been getting blazing hot sun the past few weeks - using pool essentials chlorine - I put chlorine in the evening every day to make it 5.5 ppm - for the past couple of weeks when I check the readings in the evening (before putting the chlorine) and it shows 1 ppm - is this normal?


Gold Supporter
Bronze Supporter
Jun 11, 2018
Verona, MO
Aeration raises the PH a bit, reduce if you are breaking water line with return or have water falls etc. Pools vary with what TA suites them. Maybe yours will settle down when you get to 60 or 70. Possibly only lower to 7.5 or so, see what happens.

For cya of 30 you don't want your FC below 2 or you are open for algae. Try running closer to 6 when you add.

Maybe do an overnight chlorine loss test to see if you have an impending algae bloom.


Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
Bedford, TX
You are in TEXAS, your CYA should be at least 50 to keep the sun from burning off the FC so quickly..

Most pools use 2 to 4 ppm of FC per day.. In Texas this time of year I would think that 4 ppm would be normal..

Quit trying to force the pH down to 7.2.. Only reduce it to 7.7 and then let it drift up until it hits 8.0 and then knock it down again...


Jim R.


Bronze Supporter
Nov 12, 2016
Plano, Texas
CYA of 50, definitely in TX, as Jimrahbe mentioned. Otherwise you’re paying for, and sacrificing most of your chlorine to the sun everyday! Protecting it with higher CYA also allows chlorine to do it’s job of keeping your pool clean and clear. Only time 30-ish is preferred is if you have to SLAM.