Replacement Filters for the Honeywell RO-9100 (5-Stage) Reverse Osmosis System
Honeywell · 5-Stage Reverse Osmosis
Replacement Filters for the Honeywell RO-9100 (5-Stage) Reverse Osmosis System
Every filter your system needs — stage by stage — led by the IPW house-brand set that costs less than the OEM parts.
Also sold as: Honeywell RO-9100 · RO-9100 · Honeywell RO-5
✓ Best value — replace everything at once
Honeywell RO-9100 set (QC fittings included)
$38.50
5µm sediment + 2 coconut carbon blocks + 50 GPD membrane + 10" inline GAC (¼" NPT) with two ¼" quick-connect fittings. Fits the Honeywell RO-9100.
🛒 Add the complete set to cartFilters by stage
Buy the whole set above, or replace stages individually below.
1
Sediment pre-filter
5µm polypropylene · 10" × 2.5" (replaces Honeywell RF-60)
IPW 5M-SED-10×2.5 — 5µm sediment — $3.50
2
Carbon block / GAC
5µm coconut carbon block · 10" × 2.5" (replaces Honeywell RF-61)
3
Carbon block / GAC (2nd)
5µm coconut carbon block · 10" × 2.5" (replaces Honeywell RF-61)
4
RO membrane
50 GPD thin-film composite · standard 1812 size
IPW TW-1812-50 — 50 GPD membrane — $32.99
5
Inline post-carbon polish
10" GAC inline · ¼" female NPT (replaces Honeywell RF-66) · includes 2× ¼" QC fittings
When to replace
🪣 Sediment & carbon: every 6–12 months🥤 Inline post-filter: every 12 months💧 RO membrane: every 2–3 years
✓ Guaranteed to fit your Honeywell RO-9100 5-stage RO.
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Honeywell RO-9100 filter FAQ
What filters does the Honeywell RO-9100 use?
Five stages: a 10" × 2.5" 5 micron sediment filter (RF-60), two 10" × 2.5" carbon blocks (RF-61), a 50 GPD RO membrane and a 10" inline GAC post-filter with ¼" NPT threads (RF-66). The RO-9100 set has all five.
Do the Honeywell RO-5 and RO-9100 use the same filters?
The same RF-60, RF-61 and RF-66 filter pack is sold for both models. Call (714) 541-6600 if your unit looks different.
Why does the inline filter come with fittings?
The RF-66 style post-filter has ¼" female NPT threads. The set includes two ¼" quick-connect fittings so you can push the tubing straight in.
How often should I change the RO-9100 filters?
Replace the sediment and carbon filters every 6 to 12 months and the inline post-filter every 12 months. The membrane usually lasts 2 to 3 years.
All replacement filters by system · Universal 5-Stage RO · Watts W-525 · PureT RO550-905
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.
