FC measurement under CYA

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RTeen

Active member
Aug 8, 2022
36
Turkey
Pool Size
24000
Surface
Plaster
Chlorine
Salt Water Generator
I am quite focused on the FC CYA discussions these days.

My question is since CYA is binding chlorine is the FC I am measuring with my test kit whatever not bound by CYA or it measures the whole chlorine?

If it shows unbound chlorine how do I know if total chlorine minus free chlorine is due to CYA or bound sweat for example?

Thanks
 

Sunnydaze

Silver Supporter
Mar 8, 2021
500
AZ
Pool Size
15000
Surface
Plaster
Chlorine
Liquid Chlorine
I am quite focused on the FC CYA discussions these days.

My question is since CYA is binding chlorine is the FC I am measuring with my test kit whatever not bound by CYA or it measures the whole chlorine?

If it shows unbound chlorine how do I know if total chlorine minus free chlorine is due to CYA or bound sweat for example?

Thanks

It measures both free chlorine and chlorine bound to cya. The combined chlorine test will measure chloramines which is chlorine being "used up" by organics.
 

Lake Placid

Well-known member
May 27, 2021
344
St. Louis
Pool Size
17000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40

TFP has a great video on the concept you’re interested in here. Joyful Noise does a great job covering the concepts specifically at about 4:20 -10:00 ish, but I’d recommend you watch the whole video for a thorough dive in.
 
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