Match the measurements
Shop by Filter Size
Measure the cartridge—not the housing. Choose the closest standard length and diameter, then verify the exact dimensions on the product page.
10 × 2.5
Shop →Standard 10-inch
The most common residential cartridge size: approximately 10 × 2.5 inches.
10 × 4.5
Shop →Big Blue 10-inch
High-flow, high-capacity cartridges with a 4.5-inch diameter.
20 × 2.5
Shop →Slim Line 20-inch
Long, narrow cartridges that double standard 10-inch capacity.
20 × 4.5
Shop →Big Blue 20-inch
Maximum-capacity standard housings for whole-house filtration.
Have a model or replacement number?Searching the number printed on the old filter is usually the fastest route.