Stage 01
5-Micron Sediment Filter
Helps capture dirt, sand, silt, visible rust particles and suspended scale debris before water reaches the carbon stage.
10″ x 4.5″ Whole House Filter Replacement Set for Dual Stage Systems – 5 Micron Sediment + Carbon Block CTO (Big Blue), SKU: SED5CTO-10BB
$26.95
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Description
Dual-stage Big Blue replacement set
Complete 5-micron sediment and 10-micron CTO carbon-block refill
This two-cartridge set restores one complete filtration cycle in compatible dual-stage whole-house systems using standard 10″ × 4.5″ Big Blue housings. Install the sediment cartridge first and the CTO carbon block second.
2 filtersOne complete replacement set
10″ × 4.5″Big Blue cartridge format
5 + 10 micronSediment and CTO stages
3–6 monthsTypical service range
Two-stage filtration
Particle prefiltration followed by carbon polishing
The first stage helps capture suspended particles that could clog the carbon block. The second stage helps improve chlorine-related taste and odor.
Stage 02
10-Micron CTO Carbon Block
Helps reduce chlorine, chlorine-related taste and odor, and many common organic compounds while providing final water polishing.
What is included
One complete Big Blue replacement cycle
- ✓One 10″ × 4.5″, 5-micron sediment filter cartridge
- ✓One 10″ × 4.5″, 10-micron CTO carbon-block cartridge
- ✓Two cartridges total—one complete change for a compatible dual-stage system
Key benefits
Big Blue capacity with a simple two-stage maintenance schedule
Complete two-filter set
One sediment cartridge and one CTO carbon block provide a matched replacement cycle.
Sediment prefiltration
The first stage helps protect the carbon block from suspended debris.
Carbon polishing
The second stage helps improve chlorine-related taste and odor.
Big Blue capacity
The 10″ × 4.5″ format provides greater media and dirt-holding capacity than slim cartridges.
Standard Big Blue fit
Fits compatible housings designed for standard 10″ × 4.5″ cartridges.
Drop-in replacement
Installs directly in compatible dual-stage whole-house housings.
Reduction guide
What the complete filter set helps reduce
Actual performance depends on source-water chemistry, sediment load, chlorine level, pressure, flow rate and cartridge condition.
Helps reduce
Sediment
Dirt and silt
Sand
Visible rust particles
Suspended scale debris
Chlorine
Unpleasant taste
Unpleasant odor
Many common VOCs
Dirt and silt
Sand
Visible rust particles
Suspended scale debris
Chlorine
Unpleasant taste
Unpleasant odor
Many common VOCs
Actual reduction and service life vary with water quality, household use, flow rate and remaining cartridge capacity.
Not designed to remove without specialty treatment
Hardness minerals
Dissolved iron
Hydrogen sulfide
Fluoride
Chloramine
Bacteria or unsafe water
Dissolved salts / TDS
Dissolved iron
Hydrogen sulfide
Fluoride
Chloramine
Bacteria or unsafe water
Dissolved salts / TDS
Chloramine generally requires catalytic carbon. Hardness usually requires a water softener, and microbiological concerns require appropriate disinfection.
Specifications
Filter size, stage order and service guidance
| Product type | Replacement filter set for compatible dual-stage whole-house systems |
|---|---|
| Number of cartridges | 2 |
| Cartridge format | Standard 10″ × 4.5″ Big Blue |
| Stage sequence | 5-micron sediment → 10-micron CTO carbon block |
| Sediment rating | 5 micron nominal |
| CTO rating | 10 micron nominal |
| Listed flow rate | Up to approximately 5–10 GPM, depending on system setup |
| Typical service life | Approximately 3–6 months, depending on water quality and use |
| Housing compatibility | Compatible standard 10″ × 4.5″ Big Blue housings |
| SKU | SED5CTO-10BB |
| Listed shipping dimensions | 10 × 10 × 5 in |
Replacement procedure
- ✓Shut off the water supply and relieve system pressure before opening the housings
- ✓Install the 5-micron sediment cartridge in the first housing
- ✓Install the 10-micron CTO carbon block in the second housing
- ✓Inspect and clean the housing sumps and O-rings during replacement
- ✓Pressurize the system slowly and inspect for leaks
- ✓Flush the new carbon filter until carbon fines are cleared before normal use
Compatibility
Fits compatible dual-stage Big Blue whole-house systems
Confirm the housing size and stage order before purchase. This set does not fit standard 10″ × 2.5″ slim housings.
S
5-Micron Big Blue Sediment Filter
The first-stage cartridge is also available separately for systems with heavier sediment loading.
CTO
10-Micron Big Blue CTO Filter
The second-stage carbon block is also available separately for independent replacement.
3F
Triple-Stage Replacement Set
Add a GAC stage when a three-filter sediment + GAC + CTO configuration is required.
WH
Big Blue Whole-House Systems
Fits compatible dual-stage systems using standard 10″ × 4.5″ housings.
Before purchase
Good to know
!
Confirm Big Blue size
This set fits 10″ × 4.5″ Big Blue housings and does not fit standard 10″ × 2.5″ slim housings.
This set fits 10″ × 4.5″ Big Blue housings and does not fit standard 10″ × 2.5″ slim housings.
!
Install in the correct order
The sediment cartridge must be installed first, followed by the CTO carbon block.
The sediment cartridge must be installed first, followed by the CTO carbon block.
!
This set is not a water softener
The included filters do not remove dissolved hardness minerals or prevent all mineral scale.
The included filters do not remove dissolved hardness minerals or prevent all mineral scale.
!
Check whether your city uses chloramine
The standard CTO carbon block is intended primarily for chlorine. Chloramine generally requires catalytic carbon.
The standard CTO carbon block is intended primarily for chlorine. Chloramine generally requires catalytic carbon.
!
Service life varies
Heavy sediment, high chlorine levels, reduced pressure or high household use may require earlier replacement.
Heavy sediment, high chlorine levels, reduced pressure or high household use may require earlier replacement.
!
Flush before normal use
Initial dark water may be caused by harmless carbon fines. Flush to drain until the water runs clear.
Initial dark water may be caused by harmless carbon fines. Flush to drain until the water runs clear.
This product includes two replacement cartridges only. Filter housings, mounting bracket, housing wrench, valves and plumbing fittings are not included. The set does not significantly reduce TDS and is not intended to make microbiologically unsafe or unknown-quality water safe to drink.
Not sure whether this Big Blue replacement 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 | 64 oz |
|---|---|
| Dimensions | 10 × 10 × 5 in |
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