FC loss after Calcium add

vbertone

Silver Supporter
Dec 20, 2015
168
Arnold md.
So I read quite a few threads that have had similar issues with loss of FC to 0 after adding Calcium to raise the hardness. Is it possible. I had FC of 6 this morning and now at 3:30 a fc of 0 and low ph, 7.2. My cya is almost 0 though but could I lose that much fc in a day?
Seems odd
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
43,965
Laughlin, NV
You are not adding your test results to your Poolmath app so I cannot see what chemistry parameters you have. The addition of pure calcium chloride will not effect the FC.
 

vbertone

Silver Supporter
Dec 20, 2015
168
Arnold md.
You are not adding your test results to your Poolmath app so I cannot see what chemistry parameters you have. The addition of pure calcium chloride will not effect the FC.
I had no idea others could see that. Just added my results after just testing. The calcium is not 100% pure but is the hardness increase from the pool store. Could not find straight calcium locally before I opened.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
43,965
Laughlin, NV
With 0 CYA, the FC half life with sun on the pool surface is about 50 minutes. So you can go from 6ppm FC in the morning to essentially 0 in a few hours.
 

vbertone

Silver Supporter
Dec 20, 2015
168
Arnold md.
With 0 CYA, the FC half life with sun on the pool surface is about 50 minutes. So you can go from 6ppm FC in the morning to essentially 0 in a few hours.
Wow I had no idea, I am always learning something on here. Got to get my cya up then. Will get some liquid conditioner tomorrow. Thx
 
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