Quote Originally Posted by CarlD View Post
AH!!!! So THAT'S why PBs love to install cartridge filters! Thanks, Kelly!

They take on the nasty messy job of cleaning them for a fee! I never knew that--DE and Sand filters don't require such a service.
Here's another reason, ease of installation due to no backwash line.

I disagree on the second sentence, DE filters should also be disassembled and cleaned in April and October. I do agree completely with your first reply to this thread, as a sand filter gets dirty it cleans better.
The only time I suggest changing sand is when a pool owner lets his pool go to pot and it's totally green and won't come back with nuking, filtering, and backwashing.

see ya,
Kelly