High-flow granular activated carbon in the Big Blue format — coconut-shell GAC that takes the bulk of chlorine, taste, odor, and organic chemicals (VOCs) out of your water with minimal pressure drop.
Stage
Pre-carbon · after sediment
Fits
Standard Big Blue housings
What it does
The GAC-10BB is a granular activated carbon cartridge — loose coconut-shell carbon granules in a rigid Big Blue shell. As water flows through the carbon bed, the granules adsorb chlorine and the organic compounds (VOCs) behind bad taste and odor.
GAC’s strength is flow. Water moves through a granular bed far more freely than through a solid carbon block, so this cartridge delivers strong chlorine and taste reduction with minimal pressure drop — a real advantage on a whole-house line where every shower and appliance shares the same supply. The coarse 25-micron rating reflects that role: it’s a chemical-adsorption workhorse, not a fine particle filter.
In multi-stage systems, GAC typically runs as the pre-carbon stage: sediment first, GAC second to do the heavy chemical lifting, then optionally a carbon block (CTO) as the fine polishing stage. In a two-housing setup, sediment + GAC is the classic high-flow pairing.
Key benefits
- ✓ Reduces chlorine, bad taste & odor house-wide
- ✓ Helps reduce organic chemicals (VOCs)
- ✓ Coconut-shell granular activated carbon media
- ✓ High flow with low pressure drop — GAC’s specialty
- ✓ Ideal pre-carbon stage ahead of a carbon block
- ✓ Protects plumbing & downstream filters
Specifications
| Cartridge type |
Granular activated carbon — GAC (Big Blue) |
| Nominal size |
10″ × 4.5″ |
| Micron rating (nominal) |
25 micron |
| Media |
Coconut-shell granular activated carbon; polypropylene shell |
| Recommended position |
Pre-carbon stage — after sediment, before a carbon block (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 |
GAC-10BB |
Helps reduce
What this cartridge targets — and what it isn’t built for.
Chlorine
Bad taste
Odor
Organic chemicals (VOCs)
Fine sediment
Chloramine
Iron / H₂S
Scale / hardness
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 |
Whole-house pre-filtration · municipal or moderate sediment |
| Carbon stages |
| GAC-10BB (this filter) |
Granular activated carbon · 25 µm |
High-flow chlorine, taste & VOC reduction · pre-carbon stage |
| 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
GAC vs. carbon block. GAC gives you the highest flow and least pressure drop; carbon block (CTO / CACB) gives you finer filtration and polishing. Three-housing systems often run both: sediment → GAC → carbon block. If you have two housings and pressure matters most, sediment + GAC is the pairing.
Always run sediment first. A 25-micron GAC bed isn’t a sediment filter — grit shortens its life and can channel the bed. Keep SED5-10BB ahead of it.
Flush on install. New GAC cartridges release harmless carbon fines at first — run water to drain for a few minutes until it clears before use.
Building a full stack?
Classic 3-stage whole house
SED5-10BB → GAC-10BB → CTO-10BB carbon block
High-flow 2-stage
SED5-10BB (Stage 1) + GAC-10BB — least pressure drop
Best-taste upgrade
Finish the stack with CACB-10BB premium coconut block
Well water with iron or scale
Add IRON-10BB or SCALE-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.