FC loss after Calcium add

vbertone

Silver Supporter
Dec 20, 2015
168
Arnold md.
Pool Size
25000
Surface
Plaster
Chlorine
Liquid Chlorine
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
44,387
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
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.
Pool Size
25000
Surface
Plaster
Chlorine
Liquid Chlorine
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
44,387
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
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.
 
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