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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Compatibility reference only. Photos of complete systems shown on this page are provided to help you identify your unit and confirm that our filters fit. All brand names, model numbers, and product images are the property of their respective owners; Isopure Water (IPW Industries Inc.) is not affiliated with, sponsored by, or endorsed by these manufacturers. We sell compatible replacement filters and parts — not the branded systems pictured, unless a system is separately listed for sale on our store.
