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

HydroLogic Stealth-RO and smallBoy KDF85 Catalytic Carbon Filter Upgrade

Upgrade your HydroLogic Stealth-RO and smallBoy system's pre-filtration with this KDF85 Catalytic Carbon Filter. The more porous catalytic carbon media, combined with KDF85 alloy, captures a wider range of contaminants than standard coconut carbon, including water-soluble metals, chlorine, chloramines, iron, sulfur, scale, and heavy metals. Replace every 2,000 gallons for Stealth-RO systems, or every 6,000 gallons for smallBoy systems.

Key Features & Benefits

• KDF85 + Catalytic Carbon Media: Broader contaminant reduction than standard carbon, including chloramines and iron.
• More Porous Media: Increases effective contact time and adsorption capacity versus coconut carbon.
• Scale Reduction: Helps protect RO membranes and downstream equipment from mineral buildup.
• For Stealth-RO and smallBoy Systems: Engineered as a drop-in upgrade over the standard green coconut carbon filter.

Who Should Use This

Growers dealing with high iron, sulfur, or chloramine levels in source water who want maximum pre-filtration before the RO stage. Well-water users and municipal-supply growers using chloramine disinfection benefit most.

Compatibility

Designed for HydroLogic Stealth-RO and smallBoy systems. Systems ship standard with Green Coconut Carbon filters -- this is an upgrade replacement.

Frequently Asked Questions

What is the difference between KDF catalytic carbon and standard coconut carbon?

KDF85 media uses a copper-zinc alloy to electrochemically reduce chlorine, heavy metals, and sulfur -- contaminants standard carbon alone may not fully capture. The catalytic carbon component is more porous than coconut carbon, extending effective contact time.

When should I replace this filter?

Replace every 2,000 gallons for Stealth-RO systems, or every 6,000 gallons for smallBoy systems. Track your system's usage or pressure readings so you catch the replacement point before performance drops off.

Do I need to replace the whole housing?

No -- this is a cartridge-only replacement. The existing filter housing remains in place.

Does this filter address chloramine?

Yes -- the catalytic carbon media is effective against chloramine, unlike standard coconut carbon filters used in Stealth-RO and smallBoy systems, which often cannot fully remove it. This makes the KDF85 upgrade worthwhile for growers on municipal water treated with chloramine.