Name: 4-Filter Replacement Set for 5-Stage Remineralization Countertop RO Systems — Sediment, T28, T33 & 4-in-1 Mineral Filter with 8 Fittings — SKU 4FILTERM - MyAquaFilter®
SKU: 4FILTERM
Availability: InStock

4 Filter Set for 5-stage Remineralization Countertop RO Systems, including Sediment, T28, T33 and 4-in-1 Remineralization inline filters. Compatible with most 5 Stage portable/countertop RO purification systems. SKU: 4FILTERM1

4-Filter Replacement Set for 5-Stage Remineralization Countertop RO Systems — Sediment, T28, T33 & 4-in-1 Mineral Filter with 8 Fittings — SKU 4FILTERM

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4 Filter Set for 5-stage Remineralization Countertop RO Systems, including Sediment, T28, T33 and 4-in-1 Remineralization inline filters. Compatible with most 5 Stage portable/countertop RO purification systems. SKU: 4FILTERM1

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Description

4-filter maintenance set for 5-stage remineralization countertop RO

Sediment, T28 carbon, T33 post-carbon, and 4-in-1 mineral cartridges with eight replacement fittings

This maintenance set is designed for compatible 5-stage remineralization portable and countertop reverse-osmosis systems using inline quick-connect filters. It replaces the four non-membrane filtration cartridges and includes eight replacement fittings for renewing the inlet and outlet connections during service.

4 filtersAll non-membrane cartridges

8 fittingsReplacement connections included

10″ × 2″Inline cartridge format

No membraneRO membrane sold separately

Routine system maintenance

Replace the sediment, carbon, and mineral stages without changing the RO membrane

This set is intended for the regular service interval when the four inline cartridges need replacement but the existing RO membrane is still producing the required rejection. Replacing the complete non-membrane set helps restore flow, chlorine pretreatment, membrane protection, taste polishing, and final remineralization.

Four cartridges

Stages 1, 2, 4, and 5

Includes the sediment prefilter, T28 coconut carbon prefilter, T33 coconut carbon post-filter, and 4-in-1 remineralization cartridge.

Service hardware

Eight Replacement Fittings

Includes two replacement fittings for each inline cartridge, allowing the inlet and outlet connections to be renewed during installation.

Four replacement filters

Particle protection, carbon pretreatment, taste polishing, and mineral treatment

5-Micron Sediment Filter

Helps capture rust, sand, dirt, and suspended particles before they reach the carbon filter and RO membrane.

T28 Coconut Carbon Filter

Helps reduce chlorine, taste, odor, and selected organic compounds while helping protect the RO membrane.

T33 Coconut Carbon Filter

Provides final taste and odor polishing after reverse osmosis and before remineralization.

4-in-1 Remineralization Filter

Contains tourmaline stone, bioceramic media, maifan stone, and alkaline mineral media. It may add selected soluble minerals and gently increase the pH of acidic RO water.

Package contents

Filters and replacement fittings included

✓1 × 5-micron inline sediment filter
✓1 × T28 coconut-shell activated carbon prefilter
✓1 × T33 coconut-shell activated carbon post-filter
✓1 × 4-in-1 remineralization post-filter
✓8 × replacement fittings

Key benefits

A complete non-membrane service set for the 5-stage remineralization system

Four Matching Filters
Replaces all non-membrane cartridges in a compatible five-stage remineralization countertop RO system.

5µ

Sediment Protection
Helps protect the carbon stage and RO membrane from suspended particles.

T28

Chlorine Pretreatment
The T28 carbon stage helps reduce chlorine before water reaches the membrane.

MIN

Mineral Post-Treatment
The 4-in-1 cartridge may add selected minerals and gently increase the pH of acidic RO water.

8FT

Eight New Fittings
Provides replacement inlet and outlet fittings for all four cartridges.

Inline Quick-Connect Format
Designed for compatible classic countertop systems using 1/4″ tubing connections.

Specifications

Verified cartridge details

Product type	Four-filter maintenance set for 5-stage remineralization countertop RO systems
Compatible system type	Selected portable and countertop RO systems using sediment, T28, RO membrane, T33, and 4-in-1 remineralization stages
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
Post-carbon filter	T33 coconut-shell activated carbon, approximately 10″ × 2″, 1/4″ female ports
Mineral post-filter	4-in-1 remineralization cartridge, approximately 10″ × 2″, 1/4″ female ports
Listed mineral media	Tourmaline stone, bioceramic media, maifan stone, and alkaline mineral media
Replacement fittings	8 pieces included
Filter quantity	4 cartridges total
RO membrane	Not included
Listed package dimensions	12 × 6 × 6 in
Listed package weight	5 lb
SKU	4FILTERM
Parent SKU listed	4FILTERM1

Typical replacement schedule

✓Sediment filter: replace based on flow, discoloration, sediment load, or the system schedule
✓T28 carbon filter: approximately 8–12 months, depending on water quality and usage
✓T33 carbon filter: approximately 8–12 months, depending on water quality and usage
✓4-in-1 mineral filter: approximately 8–12 months or when taste, pH, or mineral performance changes
✓RO membrane: inspect separately and replace based on age and measured rejection

Compatibility checklist

Confirm the existing system before ordering

✓

Five-stage remineralization configuration
The system should use sediment, T28 carbon, RO membrane, T33 carbon, and 4-in-1 mineral stages.

✓

Inline 1/4″ tubing connections
Confirm that the existing cartridges use compatible 1/4″ tubing and removable fittings.

✓

Existing membrane still performs properly
This maintenance set does not include a replacement RO membrane.

✓

Correct stage order
Install each cartridge according to its flow arrow and original position in the system.

Replacement guidance

Plan approximately 30–40 minutes for the filter change

Shut Off and Depressurize

Disconnect the system from the faucet and allow pressure to dissipate before removing tubing or fittings.

Record the Tube Routing

Photograph and label each tube before disconnecting the old cartridges.

Replace One Filter at a Time

Match each flow arrow and stage position, then install the supplied replacement fittings.

Flush and Check for Leaks

Pressurize slowly, inspect every connection, and flush the new carbon and mineral filters before using the water.

Before purchase

Good to know

RO membrane is not included
This set replaces the four non-membrane cartridges only.

Wrench is not included
A membrane-housing wrench is unnecessary for this cartridge-only maintenance set.

Mineral and pH results vary
Final TDS, mineral release, and pH depend on source-water chemistry, flow, contact time, and cartridge condition.

TDS may increase after remineralization
A higher final TDS reading can be expected because the mineral stage adds dissolved material after reverse osmosis.

Flush before use
New carbon and mineral media require thorough flushing before taste, TDS, and pH readings stabilize.

Photo must show all included parts
The updated product image should display all four cartridges and all eight replacement fittings.

This product includes four replacement filter cartridges and eight replacement fittings. It does not include an RO membrane, membrane housing, wrench, frame, clips, tubing set, faucet adapter, or flow restrictor.

Not sure whether this set matches your remineralization countertop RO system?
Send the system model, filter labels, tubing size, and clear photos of the existing assembly before ordering.

Ask a Water Filter Specialist