Any 10" filter cartridge. I get the Culligan or whatever Wal-Mart has a 2 pack of. I have 2 filters, 1 before a water softener with a sediment cartridge & the original RW after the softener with a charcoal cartridge.
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Danny & Linda
Full-timed 10+ years
Former '13 FB owner
Traded '13 GMC Denali DRW D/A
Currently rv & truckless
Replacement undetermined