Search·3M
When you know your system or housing model number, this page lists the replacement cartridges we match to it—compare length, diameter, and micron rating before you order.
Brand
3M
Model AP903
3M Aqua-Pure AP903 whole house water filter system
Series: Aqua-Pure
These cartridge numbers are matched to this system model in our reference. Compare length, diameter, and micron rating with the filter you’re removing or your housing specs before ordering.
Primary part on file
AP910R
3M Aqua-Pure carbon cartridge for AP900-series high-flow systems
Replace about every 12 months
AP910R may fit model AP903, but compare the part number carefully before you buy.
Why this part
- 2 mapped replacement cartridge options for this whole-home system model in our reference
- Notes available for this part
- No BuckParts Verified Link yet for this filter number. We haven’t found a retailer product page we’re comfortable showing.
Replacement cartridge fit for this system model is based on our reference data.
Do not buy yet until you verify your system or housing model number and the cartridge number against the part you are removing, your housing specs, or your owner’s manual.
BuckParts Verified Links
A place to buy that BuckParts has checked against the part, listing, and evidence we trust. Not every filter page has one—we only show a link when our checks clear for this part number.
BuckParts does not have enough proof to show a buy button for this replacement cartridge yet. Verify the cartridge number and dimensions against the cartridge you are removing or your housing specs first.
- Some listings we have on file are not product pages we can safely link to yet, so those stay hidden.
All details for this part (notes, compatible models, BuckParts Verified Links when listed)
Other parts that also fit this model
Less common crosses — open each for full part details.
Notes & next steps
Search again if you need a different model or part number.
High-flow AP900-class head; commonly serviced with AP917HD-S + AP910R on dual-stage installs — confirm your sticker.