Your filter’s lifespan isn’t a guessing game. It’s a math problem with three main variables. First up: your water source. City water? You might stretch it to six months. Well water? You’re in a mud fight every season.
Well water is a sneaky beast. It brings in fine sand, clay, and sometimes iron that just loves to clog your filter. If you’ve got a heavy sediment load, you might be swapping cartridges every two to three months. No shame in that game.
Second variable: the size of your filter. That big honking 20-inch cartridge? It lasts longer than the little 10-inch guy. It’s like comparing a large pizza to a personal pan—you get more slices before you’re hungry again.
The “Gross Scale” Test
Here’s a trick I use. Mark your calendar for three months, then pull the filter out. Hold it up to the light. If it looks like a mud brick or smells like a swamp, you waited too long.
Is it just slightly tan? You might have a month or two left. But honestly, your eyeballs are the best sensor. If you’re thinking, “Ew, that’s nasty,” change it. No filter has a PhD in looking pretty—its job is to get ugly so your water doesn’t.
Still, don’t overthink it. Most manufacturers say every three months for sediment and every six to twelve months for carbon filters. That’s the safe, boring advice. But you’re not boring, right? You’re a rebel who checks their filter.
