Most sand owners will tell you just the opposite: Old sand filters better than new sand. As more junk clings permanently to the sand and doesn't backwash out, it actually filters MORE than new sand. I'm in my 11th season with the same sand, and our other long-time sand owners have gone much longer. I do add a little DE after I back wash, and use skimmer socks, especially in May and June when the pollen is very, very heavy. The sock catches the pollen, so much that it looks like yellow spackle!

I did have to replace my pump this season, but not my filter or sand. Went with another 1hp 2 speed Hayward Super Pump.