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Does anybody know of a way to test CYA below 10ppm? The lowest visual test tube I can find is 20ppm. Thanks, Tim

So - I have the Intillichem hooked up. Brand new unit and probes. PH management functionality is perfect. ORP is showing 520ish with perfectly balanced (ideal -.08 LSI). My numbers FC =2.8 CC = 0 PH=7.29 CH =320 Alk=110 CYA=18 NaCL=3800 I have read a bunch of posts just saying to use...

My FC always seems to hover at 5.5. I have an IC 40 SWCG running at 20%, for 12 hours a day. I have a VS pump running at 1700rpm for normal turn over. It's a 22K pool, and is covered most of the time with an autocover as I have small kids. I wouldn't even be bringing this up, but I keep...

Is CYA really necessary? Here is why I ask - I have a 22K gallon SW pool with a 40K SWG on it. I don't seem to be losing much if any chlorine to sun because I have an auto cover and the pool is covered most of the time. In fact, I have my SWG down to 30% and my LSI is -.08. BUT my chlorine...