High CYA, Crystal clear water


Active member
Nov 21, 2018
Dallas, TX
I have the TFP test (which I love!) and I'm getting a reading of 110 on the CYA, FAC 11, PH 7.5, TA 80, CH 300. How could my CYA be so high but my water so clear? I thought the high CYA makes the water cloudy.

BTW, I'm going to drain a lot of water tomorrow and refill. Yes, I'm still using the tablets as opposed to liquid chlorine!


Mod Squad
LifeTime Supporter
Jan 17, 2012
Evans, Georgia
No, the CYA just holds your chlorine in place. Your FC of 11 means you are maintaining a high enough Free Chlorine level that protects you from algae. If your FC had been a lot lower you'd surely be green and cloudy.



Gold Supporter
Jun 28, 2017
Fresno, CA
If you start with fresh water you can expect to be back at 110 CYA after you have added about 73 trichlor tablets (8oz) over the year(s).