The cartridge for orange stains and metallic-tasting water: ion-exchange resin that reduces dissolved (clear-water) iron and manganese and takes the edge off hardness — before the staining reaches your fixtures, sinks, and laundry.
Stage
Specialty stage · after sediment
Fits
Standard Big Blue housings
What it does
Dissolved iron is sneaky: water pours from the tap perfectly clear, then leaves orange-brown stains on sinks, toilets, fixtures, and laundry as the iron oxidizes in the open air. This cartridge attacks the problem while the iron is still dissolved, using cation-exchange resin — the same media family as a water softener — to capture ferrous (clear-water) iron and manganese as water passes through the bed.
Because it’s softening resin, it does double duty: it also reduces water hardness (calcium and magnesium). On low-to-moderate hardness water, that means less scale and better soap performance as a side benefit — a light-softening effect, not a replacement for a full softener on very hard water.
Run it in a standard 10″ × 4.5″ Big Blue housing after a sediment stage. One honest scope note that matters: this cartridge is for clear-water iron only. If your water already comes out of the tap red, orange, or rusty, the iron has oxidized to particles — that’s a job for oxidizing/backwashing iron treatment, not exchange resin.
Key benefits
- ✓ Reduces dissolved (ferrous) iron & manganese in clear water
- ✓ Helps reduce orange/rust staining on fixtures, sinks & laundry
- ✓ Softening resin reduces hardness (calcium & magnesium)
- ✓ Helps with metallic taste from iron
- ✓ Best for low-to-moderate hardness & clear-water iron wells
- ✓ Drops into any standard Big Blue housing
Specifications
| Cartridge type |
Iron reduction + softening — ion-exchange resin (Big Blue) |
| Nominal size |
10″ × 4.5″ |
| Micron rating (nominal) |
25 micron |
| Media |
Iron-removal / softening cation-exchange resin; polypropylene core & outer shell |
| Recommended position |
Specialty stage — after sediment (typically Stage 2) |
| Operating temperature |
40 °F – 100 °F (cold water use) |
| Max pressure |
90 PSI |
| Typical life |
2–6 months (varies with iron level, hardness & usage) |
| Brand |
MyWaterClub (made for MyWaterClub) |
| SKU |
IRON-10BB |
Helps reduce
What this cartridge targets — and what it isn’t built for.
Dissolved (ferrous) iron
Manganese
Hardness (Ca & Mg)
Rust staining
Red / already-oxidized iron
Chlorine / taste & odor
H₂S odor
Sediment
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 |
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 |
| BC-10BB |
Bone char · 25 µm |
Helps reduce fluoride, heavy metals & arsenic (plus taste & odor) |
| IRON-10BB (this filter) |
Iron-removal + softening resin |
Clear-water (dissolved) iron & manganese · light softening |
| SCALE-10BB |
Scale-inhibitor media |
Scale protection for heaters & appliances (does not remove hardness) |
Good to know before you buy
The glass test — is your iron clear-water or red-water? Fill a clear glass from the tap. If the water is clear but develops an orange tint after sitting (or you get stains despite clear water), your iron is dissolved — this is the right cartridge. If the water comes out red, orange, or rusty, the iron is already oxidized into particles; exchange resin won’t fix it, and you need oxidizing/backwashing iron treatment. Not sure? Bring a sample by our San Diego office for free testing, or ask us.
Light softening, honestly scoped. The resin reduces hardness as it captures iron, which helps on low-to-moderate hardness water. It is not a substitute for a full water softener on very hard water — the cartridge simply doesn’t hold enough resin for that duty.
On chlorinated city water, put carbon first. Chlorine degrades cation-exchange resin over time. If you’re on municipal water, run a carbon stage (GAC or CTO) ahead of this cartridge; on well water (where most iron problems live), that’s not a concern.
Shortest interval in the range — by design. Exchange resin exhausts as it loads with iron and hardness. Replace every 2–6 months: closer to 2 with higher iron levels, and sooner if staining or metallic taste returns.
Building a full stack?
Well water with clear-water iron
SED5-PLT-10BB washable sediment → IRON-10BB
City water with iron from old pipes
SED5-10BB → GAC-10BB carbon → IRON-10BB
Iron + hard-water scale
IRON-10BB → SCALE-10BB as the final stage
Iron + rotten-egg odor
Consider CATKDF85-10BB, or ask us — heavy H₂S needs dedicated treatment
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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