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$19.95
Ion-exchange resin that reduces dissolved iron and softens hard water in one stage — cutting rust staining, metallic taste, and scale while protecting the filters downstream.
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Stage
Specialty · Pre-Carbon
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Size
10″ × 2.5″
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Micron
25 µm
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Life
3–4 months
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Fits
Standard 10″ housings
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This cartridge is filled with ion-exchange (cation) resin — the same media used in water softeners. As water passes through, the resin swaps its sodium ions for dissolved (ferrous) iron and for the calcium and magnesium that cause hard water. The result: less rust staining and metallic taste, and softer water in a single specialty stage.
Reducing iron early also protects the filters downstream — it keeps dissolved iron from oxidizing and fouling your carbon cartridges, RO membrane, and plumbing. It works best installed after a sediment pre-filter and before your carbon stage.
Because a cartridge holds a fixed amount of resin and doesn’t self-regenerate like a full softener tank, it’s built for low-to-moderate iron and hardness and has a shorter service life — plan on replacing it every 3–4 months (sooner on heavier water). Standard 10″ × 2.5″ (9⅞″ × 2.5″) dimensions fit common housings.
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Reduces dissolved (ferrous) iron that causes rust staining
Softens water — reduces calcium & magnesium hardness
Cuts metallic taste and water discoloration
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Helps reduce scale on fixtures & appliances
Protects downstream carbon & RO filters from iron fouling
Standard 9⅞″ × 2.5″ — drops into common housings
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What this cartridge targets — and what it isn’t built for.
The full MyWaterClub 10″×2.5″ range by stage. Your current filter is highlighted.
Ferrous (dissolved) iron only. This resin works on clear-water iron — water that’s clear from the tap but stains over time. Water that’s already orange or brown contains oxidized (ferric) iron, which a sediment filter captures better. Put a sediment pre-filter first either way.
It softens too — a small amount of sodium is added. Ion exchange releases sodium as it captures iron and hardness. That’s normal for softening resin, but worth noting if you’re on a sodium-restricted diet.
Short life is expected. A cartridge can’t regenerate with salt like a softener tank, so the resin exhausts in about 3–4 months — sooner on high iron or very hard water. When iron or hardness returns, it’s time to swap the cartridge.
Not for heavy iron, sulfur, or iron bacteria. For strong iron/sulfur on well water, use a dedicated backwashing iron system; this cartridge works as a supporting stage. For rotten-egg (H₂S) odor, see the CATKDF85-10.
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Choose this if…
You have rust stains, metallic taste, or hard water from low-to-moderate dissolved iron and want iron reduction + softening in one stage.
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Look elsewhere if…
Your water smells like rotten eggs (H₂S) — the CATKDF85-10 is the better fit.
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Not enough if…
You have heavy well-water iron — pair with, or step up to, a dedicated backwashing iron system.
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| Weight | 2 lbs |
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| Dimensions | 10 × 3 × 3 in |
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