DE to sand filter?

[aylad]

Be sure you have plenty of water in the pool before you begin a backwash/rinse cycle. It tends to take a considerable amount of water, depending on how dirty the filter is. I usually do it either right after a good rain when the pool is over-full anyway, or I run the hose while I'm cleaning the filter.

Good point, and something I usually forget to check until I'm in the middle of it all and hear the skimmer sucking air!

Janet