Do sand filters need chemical cleaning?

[Pappy]

DE does help. I just figured I'd let the sand dry this winter and suck it out with my monster shop vac. Then I'll dump it in the grand kid's sand box.

Thanks!

Pappy

[CarlD]

Be careful not to damage the laterals and to get the new sand all the way under where the laterals go, and make sure they are seated properly when you put them back.