What size is a standard 10-inch filter cartridge?
10 inches long × 2.5 inches in diameter. Any cartridge with those dimensions fits any standard 10-inch housing, regardless of brand.
The most useful 30 seconds of plumbing knowledge you'll ever get.
A "10-inch housing" takes any cartridge that is 10 inches long and 2.5 inches in diameter. That's it. That's the whole standard. It's the AA battery of water filtration — one size, hundreds of manufacturers, zero lock-in. If your system uses these housings, you can buy filters from anyone, forever.
| Cartridge type | What it does | Typical change interval |
|---|---|---|
| Spun PP sediment (1–10 micron) | Catches sand, rust, silt — protects everything downstream | 6 months |
| Pleated sediment | Same job, washable, higher flow | 6–12 months |
| GAC (granular activated carbon) | Chlorine, taste, odor | 6–12 months |
| CTO carbon block (0.5–10 micron) | Chlorine + fine sediment in one cartridge | 6–12 months |
| Phosphate / scale inhibitor | Reduces scale in hard-water areas | 6 months |
| Resin / specialty cartridges | Iron, tannin, specific contaminants — match to your water | Varies |
Any of these, from any brand, drops into any standard 10" × 2.5" housing. Mix and match freely — stages are independent of each other.
"Micron" = how small a particle the filter catches. A 5-micron sediment filter catches most visible grit; a 0.5-micron carbon block catches much finer stuff. Lower number = finer filtration, but also clogs faster. For city water, 5-micron sediment → carbon block is the standard, boring, correct combo. Don't overthink it.
10 inches long × 2.5 inches in diameter. Any cartridge with those dimensions fits any standard 10-inch housing, regardless of brand.
No. RO membranes follow a different standard (usually 1812 size) and have their own membrane housing. The 10-inch standard covers pre-filters and post-filters only.
Yes. With standard 10" × 2.5" housings, stages are independent — a Brand A sediment filter works fine upstream of a Brand B carbon block. Match sizes and change intervals.
Pull one cartridge and measure it, or read its label — most print the dimensions. 10" × 2.5" means universal. Twist-lock or snap-in cartridges with no standard dimensions are probably proprietary.