How long to back wash ?
We changed over to a sand filter a few years ago (from a DE) and I do not think I have mastered the length of time it takes to back wash.
Everthing I have read says that the view vial will be cloudy and to backwash until it is "clear". I also check with a glass jar at the end of the backwash hose.
Some writings say 2 - 3 minutes, others say at least 5 minutes.
My question is: HOW clear? Just until it is "not cloudy", OR so that there are NO particles in the backwash water. It seems like it takes forever until the water is absolutely particle free. I fear I am being too anal.