System maintenance
Four Matching Filtration Stages
Includes sediment, T28 coconut carbon, the selected RO membrane, and T33 post-carbon cartridges.
4-Stage Countertop RO Replacement Filter Kit — Sediment, T28, 75/150 GPD Membrane, T33, Wrench & 6 Fittings — SKU 3SFM2
Price range: $50.00 through $99.00
4 Filter Set for 4-stage Basic Countertop RO Systems, including Sediment, T28, 75 or 150 GPD membrane, and T33 inline filter cartridges, SKU# 3SFM2
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Description
Complete 4-stage countertop RO service kit
Four replacement filters with RO membrane, wrench, and six replacement fittings
This complete maintenance set is designed for compatible 4-stage Basic portable and countertop reverse-osmosis systems using inline quick-connect filters. It replaces the sediment, T28 carbon, RO membrane, and T33 post-carbon stages and includes the service accessories needed for a more complete filter change.
4 filtersComplete four-stage replacement set
75 or 150 GPDSelect the matching RO membrane
6 fittingsReplacement connection fittings included
1 wrenchMembrane-housing service tool
Complete replacement package
Refresh all four filtration stages at the same time
The set replaces every filtration cartridge in a compatible 4-stage Basic countertop RO system. Changing the complete set helps restore sediment protection, chlorine pretreatment, membrane performance, and final taste polishing.
Service accessories
Wrench + Six Replacement Fittings
Includes one compatible membrane-housing wrench and six replacement fittings for renewing selected filter and membrane-housing connections.
Four replacement stages
Particle protection, carbon pretreatment, RO purification, and final polishing
1
5-Micron Sediment Filter
Helps capture rust, sand, dirt, and suspended particles before they reach the carbon filter and RO membrane.
2
T28 Coconut Carbon Filter
Helps reduce chlorine, taste, odor, and selected organic compounds while helping protect the membrane.
3
RO Membrane
Choose the membrane output that matches the current system configuration: 75 GPD or 150 GPD.
4
T33 Coconut Carbon Filter
Provides final taste and odor polishing after reverse osmosis.
Package contents
Filters and service parts included
- ✓1 × 5-micron inline sediment filter
- ✓1 × T28 coconut-shell activated carbon prefilter
- ✓1 × selected 75 or 150 GPD RO membrane
- ✓1 × T33 coconut-shell activated carbon post-filter
- ✓1 × membrane-housing service wrench
- ✓6 × replacement fittings
Key benefits
A more complete service kit than filters alone
Complete Four-Stage Set
Replaces every filtration stage in a compatible 4-stage Basic countertop RO system.
New RO Membrane Included
Select the same output rating used with the system’s current flow restrictor.
Membrane Protection
The T28 carbon stage helps reduce chlorine before water reaches the membrane.
Six Replacement Fittings
Refreshes selected inline-filter and membrane-housing connections during service.
Service Wrench Included
Helps open the compatible membrane housing during membrane replacement.
Inline Quick-Connect Format
Designed for compatible classic countertop systems using standard 1/4″ tubing connections.
Specifications
Verified filter details
| Product type | Complete 4-stage countertop RO replacement-filter and service kit |
|---|---|
| Compatible system type | Selected 4-stage Basic portable and countertop RO systems using inline quick-connect cartridges |
| Sediment filter | 5 micron, approximately 10″ × 2″, 1/4″ female ports |
| Carbon prefilter | T28 coconut-shell activated carbon, approximately 10″ × 2″, 1/4″ female ports |
| RO membrane options | 75 GPD or 150 GPD on the MyAquaFilter listing |
| Post-carbon filter | T33 acid-washed coconut-shell carbon, approximately 10″ × 2″, 1/4″ female ports |
| Replacement fittings | 6 pieces included |
| Service wrench | 1 included |
| Filter quantity | 4 cartridges total |
| Listed package dimensions | 12 × 10 × 6 in on MyAquaFilter; 12 × 6 × 6 in on MyWaterClub |
| Listed package weight | 56 oz / 3.5 lb on MyAquaFilter; 5 lb on MyWaterClub |
| MyAquaFilter SKU | 3SFM2 |
| Compatible SKUs | 3FILTER, 3FILTER1, and 3FILTER2 |
| MyWaterClub SKU | 3FILTER1-Mem |
Typical service life
- ✓Sediment filter: replace based on flow, discoloration, sediment load, or the system schedule
- ✓T28 and T33 carbon filters: approximately 8–12 months or up to the listed capacity, depending on water quality and usage
- ✓RO membrane: approximately 2 years, depending on source water, pressure, prefilter maintenance, and measured rejection
Compatibility checklist
Confirm the existing system before ordering
✓
Four-stage Basic configuration
The system should use sediment, T28 carbon, RO membrane, and T33 filters in this sequence.
The system should use sediment, T28 carbon, RO membrane, and T33 filters in this sequence.
✓
Inline 1/4″ tubing connections
Confirm that the existing filters use compatible 1/4″ tubing and removable fittings.
Confirm that the existing filters use compatible 1/4″ tubing and removable fittings.
✓
Matching membrane output
Select the same 75 or 150 GPD membrane rating used with the current flow restrictor.
Select the same 75 or 150 GPD membrane rating used with the current flow restrictor.
✓
Compatible membrane housing
The included wrench and membrane must match the existing classic countertop membrane housing.
The included wrench and membrane must match the existing classic countertop membrane housing.
Replacement guidance
Plan approximately 30–40 minutes for a complete filter change
1
Shut Off and Depressurize
Disconnect the system from the faucet and allow pressure to dissipate before removing tubing or fittings.
2
Record the Tube Routing
Photograph and label each tube before disconnecting the old filters.
3
Replace One Stage at a Time
Match each filter’s flow arrow and stage position, then install the supplied fittings where required.
4
Flush and Check for Leaks
Pressurize slowly, inspect every fitting, and flush the new filters before using the water.
Before purchase
Good to know
!
Confirm the membrane rating
A membrane with the wrong GPD rating may not match the installed flow restrictor or expected production rate.
A membrane with the wrong GPD rating may not match the installed flow restrictor or expected production rate.
!
Universal does not mean every system
Filter size, port type, tubing size, stage order, and membrane housing must all be compatible.
Filter size, port type, tubing size, stage order, and membrane housing must all be compatible.
!
No DI or mineral stage included
This set is for the Basic four-stage configuration and includes T33 carbon as the final stage.
This set is for the Basic four-stage configuration and includes T33 carbon as the final stage.
!
Flush before use
New carbon filters and the RO membrane require thorough flushing before taste and TDS readings stabilize.
New carbon filters and the RO membrane require thorough flushing before taste and TDS readings stabilize.
!
Inspect tubing ends
Cut damaged or deeply scored tubing ends square before inserting them into replacement fittings.
Cut damaged or deeply scored tubing ends square before inserting them into replacement fittings.
!
Photo must show all included parts
The updated product image should display four filters, one wrench, and all six replacement fittings.
The updated product image should display four filters, one wrench, and all six replacement fittings.
This product includes four replacement filters, one membrane-housing wrench, and six replacement fittings. It does not include a complete preassembled frame, membrane housing, countertop stand, faucet adapter, tubing set, clips, or flow restrictor unless explicitly selected or stated elsewhere on the product page.
Not sure whether this set matches your countertop RO system?
Send the system model, membrane GPD rating, filter labels, tubing size, and clear photos of the current assembly before ordering.
Send the system model, membrane GPD rating, filter labels, tubing size, and clear photos of the current assembly before ordering.
Additional information
| Weight | 56 oz |
|---|---|
| Dimensions | 12 × 10 × 6 in |
| Membrane | 150 Gallons per day, 75 Gallons per day |
| Choose | Assembly, Filter Set, Filter Set with new Quick Connect Fitting |
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