Cya measured by chlorine?

[Bearpeidog]

I've tested my CYA using the test kit. I find it far too subjective as it just depends on the lighting to make the black dot disappear. I was reading here that the higher your CYA the more chlorine was needed and if it was too high it wouldn't even measure.

So is this a valid way to know CYA is dialed in? I had zero chlorine. CYA was somewhere measured 50 to 80. Pool calculator indiacted I needed 9.5 cups of bleach to reach 4.0. I added that amount and chlorine was tested exactly 4. So I assume my cya is good as if I had too high of cya the chlorine would have measured lower or not at all? Perhaps I misinterpreted the article I read. My main concern is that CYA is too high at this point.

 

[woodyp]

The amount of CYA in your water has NO effect on how much FC is measured. If your CYA is zero and you add 4 FC, it will still measure the same 4 FC if your CYA was 80 instead. But do realize that a higher CYA level requires a higher minimum and target level of FC to be maintained for it. Welcome to the forum.

 

[txnole]

The role of CYA is to reduce the amount of FC lost due to sun/heat/etc. While a slightly higher FC level is required, it will be consumed less quickly.