Replacement Filters for the Watts Kwik-Change WQC4RO (11") RO Reverse Osmosis System
Watts · 4-Stage Reverse Osmosis
Replacement Filters for the Watts Kwik-Change WQC4RO (11") RO 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: Watts Kwik Change · Kwik-Change · Kwik Change · WQC4RO · WQC4RO11 · WQC · Watts WQC · WQCSC11 · WQCCC11 · WQCM11 · WQCGAC11
✓ Full change — 3 filters + 50 GPD membrane
Watts Kwik-Change WQC4RO 11" 4-Pack Kit (sed/carbon/membrane/GAC)
$228.99
Genuine Watts WQCSC11 sediment, WQCCC11 carbon block, WQCM11-50 membrane and WQCGAC11 GAC post-filter.
🛒 Add the complete set to cartMembrane still good? Get the annual 3-filter kit (1R-1Y-1B) — $98.07 or the 6-month 2-filter kit (1R-1Y) — $64.38.
Filters by stage
Buy the whole set above, or replace stages individually below.
1
Sediment pre-filter
11" Kwik-Change sediment
Watts WQCSC11 — Kwik-Change sediment — $27.05
Genuine Watts part WQCSC11 · 11" quarter-turn Kwik-Change
2
Carbon block (pre)
11" Kwik-Change carbon block
Genuine Watts part WQCCC11 · 11" quarter-turn Kwik-Change
3
RO membrane
50 GPD · 11" Kwik-Change
Genuine Watts part WQCM11-50 · 11" quarter-turn Kwik-Change
4
GAC carbon post-filter
11" Kwik-Change GAC
Genuine Watts part WQCGAC11 · 11" quarter-turn Kwik-Change
When to replace
🪣 Sediment & carbon: every 6 months🥤 GAC post-filter: every 12 months💧 RO membrane: every 2–3 years
✓ Fits the Watts Kwik-Change WQC4RO11 (11", 50 GPD). The 13" WQC4RO13 uses different parts.
Not sure this is your system? Use the Isopure Water Filter Finder → Match by system name, by the part number printed on your current filter, or by snapping a photo.
Watts Kwik-Change WQC4RO11 filter FAQ
What filters does the Watts Kwik-Change WQC4RO11 use?
Four 11" quarter-turn cartridges: WQCSC11 sediment, WQCCC11 carbon block, WQCM11-50 50 GPD membrane and WQCGAC11 GAC post-filter.
Do 13" Kwik-Change filters fit the 11" system?
No. The WQC4RO13 (100 GPD) uses 13" parts: WQCSC13, WQCCC13, WQCGAC13 and the WQCM13-100 membrane. Check the length of your cartridges, or call (714) 541-6600.
Will Watts RO-Pure push-button filters fit my Kwik-Change?
No. RO-Pure cartridges do not fit the WQC4RO11. See the Watts RO-Pure page if you have the push-button system.
How often should I change Kwik-Change filters?
Change the sediment and carbon every 6 months and the GAC post-filter every 12 months. That matches the Watts 6-month (1R-1Y) and annual (1R-1Y-1B) kits. The membrane usually lasts 2 to 3 years.
All replacement filters by system · Watts RO & OneFlow replacement filters · Watts Premier RO-Pure · Watts W-415
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.
