Quote Originally Posted by CarlD View Post
Ok, here's my take.

If your sand filter is slightly oversized (mine is) at low speed on your pump in cleans better. As the sand gets older and dirtier, it also filters better. Finally, adding a little DE powder after you back wash will down-right POLISH your water--and I've gone 2 seasons already on an $8. box of DE. .
VERY Interesting, and helpful! see my thread on "Pentair pump filter to replace Hayward" Gives me more food for thought......