- Nov 30, 2019
- 852
- Pool Size
- 8500
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
My SCG has been humming along forever, holding FC around 10, certainly in the 9-11.5 range. I check it pretty much every day (way too much I know) and with the SCG producing 3.0 ppm/day, so lots of data points. See my logs.
A few days ago I skipped a day and when I checked the morning after I was at 4.0 FC. When I last checked two days before FC was 10.0. Somehow, in two days, FC went down 6.0 ppm. That is unprecedented in my pool.
I brought FC up to 9.0 with liquid chlorine and it has held fine since. Looking for an explanation for that unexpected one time FC loss.
-Not likely a one time algae visit. Performed a OCLT just in case, zero FC loss overnight. Water is clear.
-Testing error? I re-did the test 3 times
-SCG coincidentally stopped working for those two days? Not very likely, no error messages, working fine now and I didn’t touch it.
All that brings me to the one thing I did different in those two days. I added 8 lbs of calcium chloride the day before the mystery FC 4.0 test result. Could the addition of calcium chloride cause a one time FC crash?
A few days ago I skipped a day and when I checked the morning after I was at 4.0 FC. When I last checked two days before FC was 10.0. Somehow, in two days, FC went down 6.0 ppm. That is unprecedented in my pool.
I brought FC up to 9.0 with liquid chlorine and it has held fine since. Looking for an explanation for that unexpected one time FC loss.
-Not likely a one time algae visit. Performed a OCLT just in case, zero FC loss overnight. Water is clear.
-Testing error? I re-did the test 3 times
-SCG coincidentally stopped working for those two days? Not very likely, no error messages, working fine now and I didn’t touch it.
All that brings me to the one thing I did different in those two days. I added 8 lbs of calcium chloride the day before the mystery FC 4.0 test result. Could the addition of calcium chloride cause a one time FC crash?