Replacement Filters for the AFWFilters/Oceanic 3-Stage 20" Big Blue Well Iron Whole-House System
AFWFilters/Oceanic 3-Stage 20" Big Blue Well Iron
✅ Best value — replace everything at once
IPW 3-cartridge set — every replaceable stage in one order
✓ Guaranteed to fit your AFWFilters/Oceanic 3-Stage 20" Big Blue Well Iron
📋 Typical replacement: sediment every 3–6 months · carbon every 6–12 months · iron/KDF cartridge yearly
1
Sediment pre-filter 5 micron
20×4.5 Big Blue
Replaces OEM 5-micron sediment
2
Iron/H2S KDF85+GAC catalytic
20×4.5 Big Blue
Replaces OEM KDF85 + GAC cartridge
3
Carbon block polishing
20×4.5 Big Blue
Replaces OEM Carbon block
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