Filtrex Matrikx CTO 9-3/4" - 32-250-10-GREEN - Green Carbon Block Filt – Fresh Water Systems
Hydronix CB-25-0505 NSF Coconut Activated Carbon Block Water Filter, 2.5" x 5" - 5 Micron: Replacement Water Filters: Amazon.com: Industrial & Scientific
2-pack Bluonics Big Blue Carbon Block Water Filters 5-Micron 4.5" x 10
Hydronix CB-25-1005 Whole House RO & Drinking Systems NSF Coconut Carbon Block Water Filter 2.5 x 10-5 Micron: Replacement Water Filters: Amazon.com: Industrial & Scientific