Pool Filter Source

No readable model or part number?

Measure your cartridge.

Record the outside diameter, cap-to-cap length, top, and bottom.

Before removing the cartridge

Turn off the system and follow the manufacturer’s pressure-release instructions. Ask a pool professional if you’re unsure.

Tape measure across a pool filter cartridge end cap
Measure straight across the widest part of the end cap.

Picture guide

What to measure

Tape measure across a pool filter cartridge end cap01

Outside diameter

Measure straight across the widest part of the end cap. Don’t wrap the tape around it.

Tape measure running from end cap to end cap along a filter cartridge02

Cap-to-cap length

Measure the rigid cartridge body. Leave out handles and threaded stems unless a guide specifically asks for overall length.

Open and threaded filter cartridge end caps side by side03

Both end caps

Note open holes, closed caps, handles, threads, locking tabs, or a molded sealing ring.

Filter finder

Enter what you see

If more than one cartridge uses these measurements, the result will show what else to check.

1. Measure the cartridge body

Use inches. Measure the rigid end caps, not loose pleats or a handle.

2. Choose the top
3. Choose the bottom

Save these details

Photograph the equipment label, cartridge label, full cartridge, and both ends. Keep the measurements with the photos.

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