FC loss after Calcium add

[vbertone]

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]

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]

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]

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]

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