Does CYA have a natural loss rate?

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J

jmbuys

Well-known member
Jun 13, 2018
77
MA
So as I read about higher CYA levels, seems partial water replacement/dilution is the best method to lower CYA, but what is CYA's 'natural' degradation rate in a balanced pool? I ask because I normally use dichlor to maintain FC levels, and it would seem if there wasn't some type of CYA loss over time naturally then at some point using di/tri to maintain FC would eventually lead to high levels of it of CYA in the pool. Thx!
Jeff
 
It's basically a very rough 5 ppm per month rate. What happens is the clorine oxidizes the cya eventually. So in a non tfp with 1-3 ppm FC and sky high cya it's going to take forever, but in a tfp with correct [FC/CYA][/FC/CYA] ratio, sky high cya can be lowered with time but it's not fun.

Op, diclor and triclor are unsustainable forms of clorine
 
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