HydroLogic® Stealth-RO™ & smallBoy® KDF85 Catalytic Carbon Filter Upgrade - Removes Chlorine, Chloramine & Heavy Metals

HydroLogic® KDF85 Catalytic Carbon Filter Upgrade - Advanced Pre-Filtration for Stealth-RO™ & smallBoy® Systems

The HydroLogic® KDF/Catalytic Carbon Upgrade Filter is an advanced pre-filtration solution for Stealth-RO™ and smallBoy® systems, offering a meaningful performance upgrade over the standard Green Coconut Carbon Filters these systems ship with. By combining KDF85 media with highly porous catalytic carbon, this filter captures water-soluble metals, chlorine, chloramine, and scale — broader and more effective pre-membrane treatment, especially for city water users dealing with chloramine contamination.

Key Features & Benefits

• KDF85 + catalytic carbon combination: Dual-media design captures water-soluble heavy metals, chlorine, chloramine, and scale that standard coconut carbon media alone cannot fully address.
• More porous than coconut carbon: The catalytic carbon media has a wider pore structure than standard coconut carbon, providing a broader range of contaminant removal and longer service life.
• Protects RO membranes: Removing chloramine and heavy metals before the membrane stage extends membrane service life and maintains TDS rejection performance over time.
• Flexible replacement intervals: Replace every 2,000 gallons for Stealth-RO™ systems, or every 6,000 gallons for smallBoy® systems — longer service intervals versus many standard pre-filters.

Who Should Use This

Highly recommended for Stealth-RO™ and smallBoy® users on city or municipal water supplies where chloramine is used. Also highly beneficial for growers dealing with elevated heavy metals, iron, or scale-forming minerals in their water source.

Compatibility

Direct drop-in upgrade for Stealth-RO™ and smallBoy® systems — replaces the standard Green Coconut Carbon Filter with no modifications required. Replace every 2,000 gallons for Stealth-RO™ systems; every 6,000 gallons for smallBoy® systems. Dimensions: 10.5in × 4.5in.

Frequently Asked Questions

How does this filter differ from the standard coconut carbon filter?

The standard Green Coconut Carbon Filter is effective for chlorine removal. The KDF85/Catalytic Carbon Upgrade adds KDF85 media and more porous catalytic carbon, enabling it to address chloramine, water-soluble heavy metals, and scale — a significant upgrade for city water or challenging water chemistry applications.

How often should this filter be replaced?

Replace every 2,000 gallons when used with Stealth-RO™ systems, or every 6,000 gallons when used with smallBoy® systems.

Does this filter address chloramine?

Yes — the catalytic carbon media is specifically effective against chloramine, unlike standard coconut carbon filters which often cannot fully remove it.

Does installing this upgrade require any system modifications?

No modifications are required — this filter is a direct drop-in upgrade that replaces the standard Green Coconut Carbon Filter in Stealth-RO™ and smallBoy® systems.