How much free chlorine is safe?

rdelisa

Bronze Supporter
Sep 16, 2017
55
Arvada
I just replaced my chlorine generator cell this Spring. It is now working more
efficiently than I predicted. I left it on the lowest, forgot to turn it off overnight and my FC is 12ppm. This is shock level. Turned it off, but it’s a cool day and not likely to get much lower very soon. CYA is between 60 and 70. I am using the Taylor k2600 for testing. Was hoping to swim today for my daily exercise. Is it safe with such a high FC level?
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
44,426
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
At 70 ppm CYA, your SLAM level FC is 28 ppm. As long as the FC is above 4 ppm and at or below 28 ppm, you are good to go.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
44,426
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Target is based on normal FC loss per day of 2-4 ppm. So if you are within target (high end during the peak of summer), your FC will not drop below minimum.

As you raise your FC, there is additional loss to UV over what you will see at the target range. Economy is part of TFPC.
 
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