Four cartridges
Stages 1, 2, 4, and 5
Includes the sediment prefilter, T28 carbon prefilter, Omnipure K2555-BB DI filter, and Omnipure K2567-BB KDF-55/T33 post-filter.
4-Filter Replacement Set for 5-Stage KDF/DI Countertop RO Systems — Sediment, T28, K2555-BB DI & K2567-BB KDF-55/T33 — SKU 4FILTERKDF1
Price range: $69.00 through $129.00
4 Filter Set for 5-stage Antibacterial Countertop RO Systems, including Sediment, T28, DI filter close to 0ppm and antibacterial K2567-BB inline filter cartridges, SKU# 4FILTERKDF1
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Description
4-filter maintenance set for 5-stage KDF/DI countertop RO
Sediment, T28 carbon, K2555-BB DI, and K2567-BB KDF-55/T33 replacement cartridges
This replacement set is designed for compatible 5-stage portable and countertop reverse-osmosis systems using a mixed-bed DI stage followed by an Omnipure K2567-BB KDF-55/T33 polishing filter. It replaces the four non-membrane cartridges while the existing RO membrane remains installed when it is still performing properly.
4 filtersAll non-membrane cartridges
5-stage systemRO + DI + KDF-55/T33 configuration
No membraneRO membrane not included with standard filter set
SKU 4FILTERKDF1MyAquaFilter replacement set
Routine system maintenance
Replace all four inline cartridges without replacing the RO membrane
This set is intended for the regular service interval when the sediment, carbon, DI, and KDF/carbon cartridges need replacement but the existing RO membrane still provides acceptable flow and rejection.
Stage 3 remains installed
RO Membrane Not Included
The standard filter-set option does not include the RO membrane. Replace the membrane separately when age or measured rejection indicates it is due.
Four replacement filters
Particle protection, carbon pretreatment, DI polishing, and KDF/carbon post-treatment
1
5-Micron Sediment Filter
Helps capture dust, dirt, sand, rust, and other suspended particles before they reach downstream filters and the RO membrane.
2
T28 Coconut-Shell Carbon Filter
Helps reduce chlorine, taste, odor, and selected organic compounds while helping protect the RO membrane.
4
Omnipure K2555-BB DI Filter
Mixed-bed ion-exchange media further polishes residual dissolved ions that pass through the RO membrane.
5
Omnipure K2567-BB KDF-55/T33 Filter
Combines KDF-55 media with T33 carbon to help polish taste and reduce selected residual oxidants and metals. KDF-55 may also help inhibit biological growth within the media.
Package configuration
Choose the replacement format that matches your service needs
SET
Filter Set
Includes the four replacement cartridges. Quick-connect fittings and the RO membrane are not included with this option.
ASM
Complete Assembly
The current listing describes an assembly option with the replacement filters, fittings, clips, a new RO membrane, and membrane housing for faster replacement.
Key benefits
A complete non-membrane service set for the DI + KDF countertop configuration
Four Matching Filters
Replaces every listed non-membrane cartridge in the five-stage system.
Carbon Pretreatment
Helps reduce chlorine and selected organic compounds before the RO membrane.
Mixed-Bed DI Polishing
Further reduces residual dissolved ions after reverse osmosis.
KDF-55/T33 Polishing
Combines KDF-55 media with carbon for additional post-treatment.
1/4″ Female Ports
All listed inline cartridges use 1/4″ female ports for compatible tubing and fittings.
Typical Service Time
The current page estimates approximately 30–40 minutes for standard filter-set replacement.
Specifications
Verified cartridge details
| Product type | Four-filter maintenance set for 5-stage countertop RO systems using DI and KDF-55/T33 post-treatment |
|---|---|
| Stage 1 | 5-micron sediment filter, 10″ × 2″, 1/4″ female ports |
| Sediment SKU | IL-10W-S514 |
| Stage 2 | T28 coconut-shell activated carbon filter, 10″ × 2″, 1/4″ female ports |
| T28 SKU | CL10ROT28-BB |
| Stage 3 | RO membrane — not included with standard filter-set option |
| Stage 4 | Omnipure K2555-BB DI ion-exchange filter, 10″ × 2″, 1/4″ female ports |
| Stage 5 | Omnipure K2567-BB KDF-55/T33 filter, 10″ × 2″, 1/4″ female ports |
| KDF/carbon media | Approximately 1/2 lb KDF-55 plus T33 carbon |
| Filter quantity | 4 cartridges total |
| Listed package dimensions | 12 × 10 × 8 in |
| Listed package weight | 90 oz |
| SKU | 4FILTERKDF1 |
Typical replacement schedule
- ✓Sediment filter: up to 1,500 gallons; replace sooner if flow or sediment loading indicates
- ✓T28 carbon filter: approximately 8–12 months or up to 1,500 gallons
- ✓K2555-BB DI filter: approximately 8–12 months or when post-DI TDS rises beyond the required target
- ✓K2567-BB: approximately 8–12 months or up to 1,500 gallons
- ✓RO membrane: inspect separately and replace based on age and measured rejection
Compatibility checklist
Confirm the existing system before ordering
✓
Five-stage DI/KDF configuration
The system should use sediment, T28 carbon, RO membrane, K2555-BB DI, and K2567-BB KDF-55/T33 stages.
The system should use sediment, T28 carbon, RO membrane, K2555-BB DI, and K2567-BB KDF-55/T33 stages.
✓
Existing membrane still performs properly
The standard four-filter maintenance set does not include a replacement RO membrane.
The standard four-filter maintenance set does not include a replacement RO membrane.
✓
1/4″ tubing connections
Confirm that the existing inline cartridges use compatible removable fittings and 1/4″ tubing.
Confirm that the existing inline cartridges use compatible removable fittings and 1/4″ tubing.
✓
Correct stage order
Install each cartridge according to its flow arrow and original position in the system.
Install each cartridge according to its flow arrow and original position in the system.
Replacement guidance
Plan approximately 30–40 minutes for standard filter-set service
1
Shut Off and Depressurize
Disconnect the system from the feed-water source and allow pressure to dissipate before removing tubing or fittings.
2
Record the Tube Routing
Photograph and label each tube before disconnecting the existing cartridges.
3
Replace One Filter at a Time
Match each cartridge to the original stage position and follow the directional flow arrow.
4
Flush and Leak-Test
Pressurize slowly, inspect every connection, and thoroughly flush the replacement filters before using the water.
Before purchase
Good to know
!
RO membrane is not included with the standard set
This maintenance kit replaces the four non-membrane cartridges only.
This maintenance kit replaces the four non-membrane cartridges only.
!
“Close to 0 ppm” is not guaranteed
Final TDS depends on source water, membrane rejection, DI capacity, flow, and cartridge condition.
Final TDS depends on source water, membrane rejection, DI capacity, flow, and cartridge condition.
!
“Antibacterial” should not imply disinfection
KDF-55 may help inhibit biological growth within the media, but the cartridge is not a microbiological purifier.
KDF-55 may help inhibit biological growth within the media, but the cartridge is not a microbiological purifier.
!
Quick-connect fittings are not included with the standard set
The current product page specifically describes the standard filter set as being without quick-connect fittings.
The current product page specifically describes the standard filter set as being without quick-connect fittings.
!
Assembly contents should be verified
The current page says the assembly includes filters, fittings, clips, a new RO membrane, and membrane housing; confirm exact components before final publication.
The current page says the assembly includes filters, fittings, clips, a new RO membrane, and membrane housing; confirm exact components before final publication.
!
Compatibility is not universal
Confirm filter models, port type, tubing size, stage sequence, and membrane configuration before ordering.
Confirm filter models, port type, tubing size, stage sequence, and membrane configuration before ordering.
This filter set is intended for treated potable water systems using the listed stage configuration. Reduction and final TDS performance depend on source-water chemistry, membrane rejection, flow, cartridge condition, and maintenance.
Not sure whether this set matches your countertop RO system?
Send the system model, filter labels, tubing size, membrane label, and clear photos of the existing assembly before ordering.
Send the system model, filter labels, tubing size, membrane label, and clear photos of the existing assembly before ordering.
Additional information
| Weight | 90 oz |
|---|---|
| Dimensions | 12 × 10 × 8 in |
| Choose | Assembly, Filter Set |
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