How do you convert from using all the chemicals to the BBB method. My water is driving me nuts these last 2 years. Has a mint green tint to it ,clear to see the bottom,but I can not get it to crystal clear like I have in the past.

18x32
3.5 ft deep flat bottom
11,800 gals
Havard DE Filter 1. 5 HP
Filter 12 hrs a day