Newbie with yellow/black mold, stratospheric CYA.

Hey y'all, glad to join the party! We've just bought our first house with a pool and are trying to get our bearings.

FC: 3ppm
CC: 0.5ppm
pH: 7.7
TA: 135ppm
CH: 300ppm
CYA: 200ppm after proper testing ... 210ppm? See pic, below

Water looks crystal clear to slightly cloudy, depending on the day. No color to it unless I've brushed off some mustard.

I've just backflushed and hand-washed the DE filter, and added a little chlorine over the past week (less...

Read more