little bit of green

[BigDave]

How'd you measure a CYA of 20? If that's right - the Texas sun might be contributing to your FC loss.

[vinper]

with the little black dot kit... I cant keep up with all this bleach handling , looking at the liquidator

[Watermom]

With a CYA of 20, it is hard for any pool to keep a chlorine reading through a hot sunny day. You will want to take your CYA on up. We usually suggest about 50 for most pools but some people in really hot climates deliberately keep their CYA at around 80. One of the other mods, Aylad, lives in Louisiana and probably has about the same temps as you. She runs her CYA at about 80, otherwise she finds that she can't keep chlorine in the pool. By running it little high, she also finds that she doesn't have to add bleach every day. Something to consider.