I've been loosing chlorine for most of June! I am running an intellichlor ic 40. Pool is 3 years old, swg is in its second year.
All other numbers are good and pool is sparkly clear.
Here's what I've done
Based on prior suggestions:
1. 6/14: Slammed pool to TC = 30. (8 bottles of bleach).
TC fell steadily after that even with the SWG running 100% for 12 hours/day
2. performed an OCLT on 6/19.
Night reading: TC=9, FC = 8.5
Morning reading (about 9am) TC = 8.5, FC =8.0
So I lost 0.5, but I was a bit slow getting the morning reading.
Last night 6:30pm TC =8.5, FC =8
Just now 6:30 pm TC =6.5, FC=6
So today I lost TC =2, but the SWG was running all day at 100%. It had run for 11 hours at the time of the test.
A couple of other bits of info:
The SWG is one year old. I cleaned it with muratic acid at the start of the season.
It's been very hot and sunny here in NC - high 90s. We've also had a lot of rain - but none last night.
Last year I was able to hold chlorine running the pump for 6-8 hours at 80%.
I am stumped as to what's going on - seems unlikely that the SWG is broken and how would I check anyway? Do an OCLT with the swg running?