Stage 01
5-Micron Sediment
Helps capture dirt, sand, silt, visible rust particles and suspended scale debris while helping protect the carbon cartridges and downstream equipment.
Universal Whole House Filter or Undersink Reverse Osmosis RO Replacement Set of 3 filter cartridges: Sediment, GAC, CTO Carbon Block.
$20.00
Reorder codes: 3UF24 · B07L4GXJXP
- Description
- Additional information
- Reviews (1)
Description
Universal three-stage replacement set
Sediment, GAC and CTO carbon-block cartridges for compatible whole-house and under-sink RO systems
This three-cartridge set replaces the standard prefilter sequence in compatible systems using 10″ × 2.5″ slim housings. Install the filters in order to capture suspended particles, support chlorine reduction and provide final taste-and-odor polishing.
3 filtersOne complete replacement set
10″ × 2.5″Standard slim cartridges
3 stagesSediment + GAC + CTO
2 usesWhole house or under-sink RO
What it does
Restores the standard three-stage sediment and carbon filtration sequence
Use as a complete replacement cycle in compatible three-stage whole-house systems or as the three prefilters in compatible under-sink reverse-osmosis systems.
Stage 02
Granular Activated Carbon
Helps reduce chlorine, unpleasant taste and odor, and many common organic compounds while supporting practical flow through slim housings.
Stage 03
10-Micron CTO Carbon Block
Provides final carbon polishing to help further reduce chlorine-related taste and odor before water enters the next treatment stage or household plumbing.
What is included
One complete three-cartridge replacement set
- ✓One 5-micron sediment filter cartridge
- ✓One granular activated carbon filter cartridge
- ✓One 10-micron CTO carbon-block cartridge
- ✓Three filters total—one complete change for a compatible three-stage system
Reduction guide
What the complete filter set helps reduce
The three media types address suspended particles and chlorine-related water-quality concerns. Actual performance depends on source water and operating conditions.
Helps reduce
Sediment
Dirt and silt
Sand
Visible rust particles
Suspended scale debris
Chlorine
Unpleasant taste
Unpleasant odor
Many common VOCs
Particle-related cloudiness
Dirt and silt
Sand
Visible rust particles
Suspended scale debris
Chlorine
Unpleasant taste
Unpleasant odor
Many common VOCs
Particle-related cloudiness
Actual reduction and cartridge life depend on water chemistry, sediment load, pressure, flow rate, household use and filter condition.
Not designed to remove without specialty treatment
Hardness minerals
Dissolved scale
Dissolved iron
Fluoride
Chloramine
Bacteria or unsafe water
Dissolved salts / TDS
Dissolved scale
Dissolved iron
Fluoride
Chloramine
Bacteria or unsafe water
Dissolved salts / TDS
Chloramine generally requires catalytic carbon; hardness usually requires a softener; microbiological concerns require suitable disinfection; dissolved contaminants may require specialty media or reverse osmosis.
Fit and maintenance
Standard slim-cartridge compatibility and replacement guidance
| Product type | Universal three-cartridge replacement set |
|---|---|
| Compatible applications | Compatible three-stage whole-house systems and under-sink RO prefilter housings |
| Number of cartridges | 3 |
| Cartridge format | Standard 10″ × 2.5″ slim; carbon cartridges approximately 9 3/4″ long |
| Stage sequence | Sediment → GAC → CTO carbon block |
| Sediment rating | 5 micron nominal |
| CTO rating | 10 micron nominal |
| Sediment capacity | Approximately 3–12 months, depending on sediment load and use |
| GAC capacity | Listed up to 1,800 gallons |
| CTO capacity | Listed up to 1,000 gallons or approximately 3–12 months |
| Operating temperature | 36–100°F; cold water only |
| Listed maximum pressure | Up to 100 PSI at cartridge level; follow the lower limit of the installed housing or system |
| Reorder codes | 3UF24 · B07L4GXJXP |
| Listed shipping dimensions | 11 × 8 × 3 in |
| Listed shipping weight | Approximately 40 oz / 2.5 lb |
Installation and replacement order
- ✓Shut off the water supply and relieve system pressure before opening the housings
- ✓Install the sediment filter in the first housing
- ✓Install the GAC filter in the second housing
- ✓Install the CTO carbon block in the third housing
- ✓Inspect, clean and lubricate compatible housing O-rings as required
- ✓Pressurize slowly, inspect for leaks and flush new carbon filters before normal use
Compatibility
Fits compatible systems using standard 10″ × 2.5″ drop-in cartridges
Confirm cartridge size and stage order before purchase. In an RO system, these are prefilters only and do not replace the RO membrane, postfilter, remineralization filter or DI cartridge.
WH
Three-Stage Whole-House Systems
Fits many compatible three-stage systems that use standard slim 10″ × 2.5″ housings.
RO
Under-Sink RO Prefilter Housings
May replace the sediment, GAC and CTO prefilters in compatible under-sink RO systems using standard drop-in housings.
S
Individual Sediment Filter
Replace the first-stage cartridge separately when sediment loading occurs sooner than carbon exhaustion.
C
Individual Carbon Filters
GAC and CTO cartridges are also available separately for systems with different replacement schedules.
Before purchase
Good to know
!
Confirm cartridge size
This set fits standard 10″ × 2.5″ slim housings. It does not fit 10″ × 4.5″ Big Blue housings.
This set fits standard 10″ × 2.5″ slim housings. It does not fit 10″ × 4.5″ Big Blue housings.
!
Install in the correct sequence
Sediment must be first, followed by GAC and then the CTO carbon block.
Sediment must be first, followed by GAC and then the CTO carbon block.
!
RO membrane is not included
For under-sink RO systems, this set replaces only the three drop-in prefilters.
For under-sink RO systems, this set replaces only the three drop-in prefilters.
!
This set is not a water softener
The included media does not remove dissolved hardness minerals or prevent all mineral scale.
The included media does not remove dissolved hardness minerals or prevent all mineral scale.
!
Check for chloramine
Standard GAC and CTO media are intended primarily for chlorine. Chloramine generally requires catalytic carbon.
Standard GAC and CTO media are intended primarily for chlorine. Chloramine generally requires catalytic carbon.
!
Flush new carbon filters
Initial dark water may be caused by harmless carbon fines. Flush until the water runs clear before normal use.
Initial dark water may be caused by harmless carbon fines. Flush until the water runs clear before normal use.
This product includes replacement cartridges only. Filter housings, mounting brackets, housing wrench, valves, plumbing fittings, RO membrane and postfilters are not included. It is not intended to make microbiologically unsafe or unknown-quality water safe to drink.
Not sure whether this set fits your system?
Send the system model number or a photo of the existing cartridges and housings.
Send the system model number or a photo of the existing cartridges and housings.
Additional information
| Weight | 40 oz |
|---|---|
| Dimensions | 11 × 8 × 3 in |
| Brands | Aqua |
1 review for Universal Whole House Filter or Undersink Reverse Osmosis RO Replacement Set of 3 filter cartridges: Sediment, GAC, CTO Carbon Block.
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