The Big Blue cartridge built for chloraminated city water: genuine Centaur® catalytic carbon by Calgon that helps reduce chloramine, chlorine, and hydrogen sulfide (H₂S) odor — where standard carbon falls short.
Stage
Carbon stage · after sediment
Fits
Standard Big Blue housings
What it does
Many U.S. utilities disinfect with chloramine (chlorine + ammonia) instead of plain chlorine — it’s more stable, which is exactly why standard activated carbon struggles to remove it. Catalytic carbon is the answer: its enhanced surface chemistry actively breaks chloramine down rather than just adsorbing it, and it does the same to hydrogen sulfide (H₂S), the classic “rotten egg” odor.
This cartridge is filled with genuine Centaur® catalytic activated carbon from Calgon Carbon Corporation — the benchmark bituminous coal-based catalytic media, not a generic substitute. It handles regular chlorine, taste, and odor as well, so it can serve as the carbon stage on any municipal supply.
As a granular bed in the 10″ × 4.5″ Big Blue format, it treats whole-house flow with low pressure drop. Run it after a sediment stage as your system’s carbon workhorse — it’s the cartridge to choose whenever your utility’s water quality report says “chloramine.”
Key benefits
- ✓ Designed for chloraminated municipal water
- ✓ Genuine Centaur® catalytic carbon by Calgon Carbon Corp.
- ✓ Helps reduce chloramine, chlorine, taste & odor
- ✓ Helps reduce hydrogen sulfide (H₂S) “rotten egg” odor
- ✓ Optimized flow with low pressure drop
- ✓ Protects plumbing & downstream filters
Specifications
| Cartridge type |
Advanced catalytic carbon (Big Blue) |
| Nominal size |
10″ × 4.5″ |
| Micron rating (nominal) |
25 micron |
| Media |
Centaur® catalytic activated carbon (Calgon Carbon Corp.), bituminous coal-based; polypropylene core & cage |
| Recommended position |
Carbon stage — after sediment (typically Stage 2) |
| Operating temperature |
40 °F – 100 °F (cold water use) |
| Max pressure |
90 PSI |
| Typical life |
3–12 months (varies with water quality & usage) |
| Brand |
MyWaterClub (made for MyWaterClub) |
| SKU |
CAT-10BB |
Helps reduce
What this cartridge targets — and what it isn’t built for.
Chloramine
Chlorine
Hydrogen sulfide (H₂S) odor
Bad taste & odor
Fine sediment
Iron
Scale / hardness
Dissolved solids (TDS)
Which 10″×4.5″ cartridge do I need?
The MyWaterClub Big Blue 10″×4.5″ range by stage. Your current filter is highlighted.
| Cartridge |
Type |
Best for |
| Stage 1 — Sediment |
| SED5-10BB |
Melt-blown sediment 5 µm · disposable |
Municipal or moderate sediment — best value |
| SED5-PLT-10BB |
Pleated sediment 5 µm · washable |
Heavy sediment & well water — rinse & reuse |
| Carbon stages — high flow (granular) |
| GAC-10BB |
Granular activated carbon · 25 µm |
High-flow chlorine, taste & VOC reduction — best value |
| CGAC-10BB |
Coconut shell GAC · 25 µm |
Premium taste & VOC reduction at full GAC flow |
| CAT-10BB (this filter) |
Centaur® catalytic carbon · 25 µm |
Chloraminated city water · chloramine, chlorine & H₂S odor |
| Carbon stages — fine polishing (block) |
| CTO-10BB |
Carbon block (CTO) · 10 µm |
Everyday chlorine, taste & odor polishing — best value |
| CACB-10BB |
Premium coconut carbon block · 10 µm |
Best taste & odor polishing · longest carbon life (6–12 mo) |
| Specialty media |
| Bone Char 10BB |
Bone char carbon |
Helps reduce fluoride (plus taste & odor) |
| IRON-10BB |
Iron-removal + softening resin |
Clear-water (dissolved) iron · light softening |
| SCALE-10BB |
Scale-inhibitor media |
Scale protection for heaters & appliances (does not remove hardness) |
Good to know before you buy
Check your utility’s disinfectant first. Your city’s annual water quality report (or a quick call) tells you whether it uses chlorine or chloramine. Chloramine → this cartridge. Plain chlorine → a standard carbon stage (GAC, CGAC, or CTO) does the job for less.
Why the Centaur® name matters. “Catalytic carbon” is an unregulated phrase — media quality varies widely. Centaur® from Calgon Carbon is the industry-benchmark catalytic media, and this cartridge uses the genuine article.
Chloramine is harder than chlorine — set expectations. Reduction depends on contact time, so results at full whole-house flow are more modest than at a single faucet. For drinking-water-critical chloramine removal, pair this whole-house stage with point-of-use filtration at the tap.
Sediment first, flush on install. Keep a sediment cartridge ahead of it, and run new carbon to drain a few minutes until the harmless fines clear.
Building a full stack?
Chloraminated city water
SED5-10BB (Stage 1) + CAT-10BB catalytic carbon
3-stage with fine polishing
SED5-10BB → CAT-10BB → CTO-10BB carbon block
Plain-chlorine alternative
GAC-10BB or CTO-10BB — same job on non-chloraminated water, for less
Rotten-egg odor on well water
CAT-10BB after a pleated sediment stage (SED5-PLT-10BB)
Please note: Filter life and reduction performance depend on your water chemistry, pressure, and usage, so results vary from home to home. This product is not certified to treat water of unknown quality and is not a substitute for testing your water. Descriptions use general, qualified language and are not health claims. When in doubt, test your water or ask us and we’ll help you build the right stack.
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