Keep in mind that if you stay on top of your chlorine additions during the summer, and avoid the algae outbreaks, you can go a long time between backwashings on a sand filter. I normally only have to backwash mine once during the summer as long as I don't allow an algae outbreak and use a skimmer sock to get a lot of the fine stuff that blows into the pool. (300# sand filter, 26K gallon pool)
You also can add a handfull of DE to a sand filter to get the same filtering quality as a DE filter, if you feel the need to.......but my sand filter makes my water sparkle without the DE.
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