Holding high CL


Well-known member
Jul 19, 2007
Katy, TX
I have been adding CYA to pool over past couple of weeks. My FC was 10.5 last weds. I dropped my SWG down from 80% to 60%. I retested last night (had been out of town) and it is still at 10.5. My ph 7.4 and alk 90. I dropped my generator down to 30% for today (my pool sits in full sunlight). What else should I do? SHould I keep it running at 30% or go higher/lower and test daily??? Thanks.


LifeTime Supporter
Jul 3, 2007
Tomball, Texas
you're in the H-Town area and it's been brutally hot. I think you could leave the generator at 30 for a couple of days and it should start coming down.


TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
Silver Spring, MD
The best thing to do is to test every day towards evening, when the chlorine level will tend to be lowest, and adjust the percentage as needed. After a week or two you should zero in on the desired setting and be able to reduce how frequently you test. If you are way off, making extra large changes in the percentage can speed up the process. As long as you are testing daily any over corrections can be fixed the next day.

If your unit is not temperature compensated, AutoPilot units are most others are not, you will need to raise the percentage when it gets hot and lower it when it gets colder. With a little experience you can learn to anticipate these changes by having an idea of where the percentage should be in different seasons.