I have a newly built plaster pool and have been following the BBB method. I have noticed that my CYA seems to stay in check (with normal splashing it'll actually fall so I periodically use a tab or two every so often to keep it in the 40-50 range). As I look back at my chemical log I'm seeing that my CH is trending up (up to 344 from 276 3 wks ago). Anyone have any ideas why? At this trend it'll be out of optimal range here in the next week-ish.
I did throw a tab in the chlorinator this week to bring the CYA up a little. I might throw a second in to help get it closer to 50.