Sparkle
0
Sure, I guess I'm saying there's an implied drop because I've been adding CYA but the level isn't going up.
Understood - my question about evaporation was actually referring to water in the pool and the bucket leak test JVTrain referred to above. However, you are pointing out why I'm confused on my CYA levels - it's not lost to evaporation, so where the heck is it going? Sounds like it's either a leak (which I'll check, but I honestly think is unlikely) or something is consuming/breaking down CYA (which I previously didn't know was possible, but sounds like it might be).
I think your first step should be to verify that you actually are losing CYA. There is no point in looking for a leak if you're not actually losing anything. So, you should measure a CYA increase first rather than assume that there is a drop just because you didn't see an increase.
One possibility would be to try a different brand or batch of stabilizer, in case HTH sold you something that didn't contain CYA.