1st year SWG help

[cheesemaster]

How much water should I drain to reduce my CYA level?
I used a digital meter to measure the chlorine level of 0.05.

[Poolsean]

Ouch...a digital meter is only as good as the calibration solution it's been calibrated to. Especially for a chlorine tester.
I just received a colorimeter from LaMotte that I will be trying out. But I guarantee that I will also be comparing it to my trusty Taylor K2006 test kit.

In either case, you're got quite a bit more Total Chlorine than your do Free Chlorine, which means a high amount of Combined Chlorine. To be sure, I would just consider the 0.05 ppm FC as ZERO, and treat from there.