How Often Should You Replace a Pool Filter

話題沸騰中の How Often Should You Replace a Pool Filterについて、詳しいまとめを整理して公開しています。

Not all filters are created equal, and your replacement schedule depends on the type you have. Cartridge filters, sand filters, and DE (diatomaceous earth) filters each have their own lifespan. Side note: if you don’t know which one you own, go check right now. I’ll wait.

For cartridge filters, the manufacturer usually suggests swapping them every one to two years. But if you live in a dusty area or have a lot of trees, lean toward the one-year side. A dirty cartridge is like asking a straw to suck a milkshake through a coffee filter—it just won’t work.

The sand filter: a classic that needs love

Sand filters are the old-school heroes. They don’t need a full replacement often, but the sand inside does. You should replace the sand every five to seven years. Yes, that’s a long time, but the sand degrades and loses its jagged edges, so it stops trapping debris.

And here’s the kicker: if you notice your water pressure is always high or your pool never looks crystal clear, your sand is probably done. Don’t wait until you start making excuses like Dave. “Oh, it’s just the season,” he said. It wasn’t.

DE filters: high performance, high maintenance

DE filters use powder-coated grids, and those grids can last two to three years if you’re gentle. But if you backwash incorrectly or ignore tears in the grids, you’ll be shopping for new ones sooner. Pro tip: always check your grids after winterizing. Nothing kills a filter faster than ice expanding inside.

When those grids tear, you’ll see DE powder in your pool—like a ghostly dust cloud. That means your filter is essentially useless. Replace those grids immediately, or prepare for the swamp life.