First, I'd like to thank the moderators and contributors on TFP for the invaluable information and help provided here. Friends laugh at me when they see my pool chemistry set and (homemade) magnetic stirrer - until they see my pool.
Everything seems perfect with my pool except that my Jandy 1400 SWCG seems to be struggling to produce enough chlorine. I've had to set my output to 100% to keep my FC in the 3-4 ppm range. Pump is running about eight hours during the day. The system was installed late last season. A few things that I've checked:
- First, the SWCG is definitely making chlorine. I see small bubbles coming out of my returns (now continuously that I've set the SWCG to 100%). The amount of bubbles looks typical.
- I don't think I have an algae problem. (Thankfully, due to TFP, I've never had to fight an algae bloom). I've been watching my FC and CC levels very carefully. I've been measuring chlorine levels with my TF-100 FAS/DPD one to two times a day for the past week. FC stays in the 3-4 ppm range and CC maxes out at 0.5 ppm after a day of heavy swimming and then it's back down to 0 by the next test. My overnight FC loss is 0.5 to 1.0 ppm. Water is sparkly.
- I've removed the cell and looked closely at the plates. I don't see any sign of build-up.
My last test results:
Any thoughts on what else I should look at?