Question about CYA ppm with SWG


May 10, 2018
Canton, GA
I am curious about why the CYA needs to be 70-80 ppm with SWG. Isn't that very high? I keep mine around 40 ppm with free chlorine around 3 ppm and I haven't had any issues with the water.


Mod Squad
TFP Expert
LifeTime Supporter
May 19, 2010
Tucson, AZ
:wave: Welcome to TFP!!!

A SWG adds FC very slowly. A higher CYA will better protect the FC from the sun. At a higher CYA level, you may even be able to lower your SWG output (extending its life) and still maintain the higher required FC level.

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The FC level you are maintaining is fine, likely just need to keep it above 2ppm for a CYA that low.