Our flagship Big Blue carbon stage: premium catalytic carbon plus KDF-85 media in one cartridge — advanced chloramine reduction, H₂S odor control, and help against heavy metals, with the longest service life in our carbon range.
Stage
Carbon stage · after sediment
Fits
Standard Big Blue housings
What it does
This cartridge combines two premium media in one Big Blue shell. Catalytic carbon handles the chemistry standard carbon can’t: its enhanced surface actively breaks down chloramine — the stable chlorine-ammonia disinfectant many utilities now use — along with regular chlorine and the taste and odor compounds behind bad-tasting water.
KDF-85 is a copper-zinc redox media that works by electrochemical reaction rather than adsorption. It targets hydrogen sulfide (H₂S) — the “rotten egg” odor — and helps reduce heavy metals. It also earns its keep a second way: KDF inhibits microbial growth inside the media bed and takes load off the carbon, which is why this cartridge delivers a long service life in whole-house duty.
The result is our most capable single carbon cartridge: run it after a sediment stage in a standard 10″ × 4.5″ Big Blue housing and one cartridge covers chloramine, chlorine, H₂S odor, taste, and heavy-metal reduction at whole-house flow.
Key benefits
- ✓ Advanced chloramine reduction technology
- ✓ Reduces chlorine, odor & hydrogen sulfide (H₂S)
- ✓ KDF-85 media helps reduce heavy metals
- ✓ Two premium media in one cartridge — one housing does more
- ✓ Long service life for whole-house systems
- ✓ High flow with low pressure drop
Specifications
| Cartridge type |
Premium catalytic carbon + KDF-85 (Big Blue) |
| Nominal size |
10″ × 4.5″ |
| Micron rating (nominal) |
25 micron |
| Media |
Bituminous coal-based catalytic carbon + KDF-85 copper-zinc redox media; 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 |
CATKDF85-10BB |
Helps reduce
What this cartridge targets — and what it isn’t built for.
Chloramine
Chlorine
Hydrogen sulfide (H₂S) odor
Heavy metals
Bad taste & odor
Fine sediment
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 |
Centaur® catalytic carbon · 25 µm |
Chloraminated city water · chloramine, chlorine & H₂S odor |
| CATKDF85-10BB (this filter) |
Catalytic carbon + KDF-85 · 25 µm |
Flagship: chloramine, H₂S & heavy metals · longest service life |
| 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
CATKDF85 vs. CAT — do you need the KDF? Both handle chloramine and chlorine. Choose this cartridge when H₂S odor or heavy-metal concerns are also in play, or when you want maximum service life from one housing — the KDF-85 layer takes load off the carbon and inhibits microbial growth in the bed. If chloramine alone is the issue, CAT-10BB covers it for less.
Set expectations at whole-house flow. Chloramine and heavy-metal reduction depend on contact time, so results at full household flow are more modest than at a single faucet. For drinking-water-critical reduction, pair this whole-house stage with point-of-use filtration at the tap.
Strong H₂S needs dedicated treatment. This cartridge handles light-to-moderate rotten-egg odor. A heavily sulfurous well is a job for an oxidizing/backwashing system — test your water first if the odor is severe.
Sediment first, flush on install. Keep a sediment cartridge ahead of it, and run new media to drain a few minutes until the water clears.
Building a full stack?
Flagship whole-house pairing
SED5-10BB (Stage 1) + CATKDF85-10BB
Well water with odor & grit
SED5-PLT-10BB washable sediment + CATKDF85-10BB
Chloramine-only alternative
CAT-10BB catalytic carbon — same chloramine performance, no KDF
Dissolved iron beyond KDF’s reach
Add the dedicated IRON-10BB after the sediment stage
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.
Reviews
There are no reviews yet.