Hi all and thanks for all of your help.
I had my DE Filter broken down and cleaned a few weeks ago. :15 after the gentleman left my pool turned a greenish tint, (water still clear just greenish instead of blue). Am having a terrible time getting AND KEEPING it blue now. In the same day it will go blue then back to green. Can it have anything to do with that filter break down??
Central Florida in-ground, 20,000 gallons, Size 60 DE Filter, diamond brite blue finish