DE filters catch more, but they're more work.

DE (diatomaceous earth) filters filter smaller particles than sand filters — down to about 2-5 microns, versus sand’s 20-40 microns. That means noticeably clearer water. But you pay for it in maintenance.

Sand filters are simpler. You backwash them every few weeks, maybe change the sand every 5-7 years. That’s it. They’re forgiving, cheap to run, and good enough for most residential pools. If you just want the water to look clean and not green, sand is fine.

DE filters need more attention. After backwashing, you have to add fresh DE powder. The grids or elements get clogged over time and need periodic cleaning with a hose — sometimes chemical cleaning. The components wear out faster, and replacement parts cost more. They also require disposing of the DE powder, which some areas regulate.

So the real choice: how much do you care about water clarity? If you want that sparkly, resort-pool look and don’t mind a few extra chores, go DE. If you’d rather spend less time messing with the filter and more time swimming, stick with sand.

The water in a sand filter won’t be as clear, but it’ll still be safe and swimmable.