CC rising, but FC is correct...Why?

[tlj3071]

I have a SWG that is keeping the FC at ~4.0 continuously (I check every day). My CYA is ~50, so FC should be good (slightly over 7.5% CYA). I have noticed that the CC has been slowly rising over the last few days - 0 three days ago, 0.2 two and one day ago, and 0.4 (maybe 0.3?) today. Pool was swept yesterday, filter was backwashed, and pool vac run two days ago and today. Solar cover has been on at night and up to about noon everyday.

FC: 4.0
CC: 0.4
CYA: ~50
pH: 7.6
TA: 60

 

[Jimrahbe]

tlj,

I suspect the solar cover.. Leave it off for a day and see what happens.

Keep in mind that a CC of .5 or less is not a real problem..

Thanks,

Jim R.