HydroLogic Stealth-RO and smallBoy Green Coconut Carbon Filter, 10 in (HL 22110)

Green Coconut Carbon Filter for Stealth-RO and smallBoy

This is the carbon block cartridge HydroLogic installs as standard in its Stealth-RO and smallBoy systems. HydroLogic lists it as part HL 22110, and it fits the 10 in carbon housing on both. The block is made from coconut-shell carbon, rated at 1 GPM with 10 micron nominal filtration. HydroLogic rates it to remove up to 99% of chlorine, sediment, rust and silt. It also reduces organic chemicals, sulfur and heavy metals such as lead and mercury. The block is built so it does not shed carbon fines, which shortens the rinse after installation. It also carries a greater dirt load before flow starts to drop. In a Stealth-RO, this cartridge is the second stage, right after the pleated sediment filter. Its job there is to strip chlorine before water reaches the thin-film RO membrane. In a smallBoy, it does the dechlorinating for hose-fed gardens and reservoirs. The block measures 9.75 in tall. Using non-original filters voids the Stealth-RO warranty, so this is the cartridge HydroLogic expects.

When to Change a smallBoy Carbon Filter or Stealth-RO Cartridge

Replacement timing depends on which system the cartridge sits in. In a Stealth-RO, HydroLogic rates it for about 1,250 gallons of purified water. In a smallBoy, the same cartridge is rated for about 3,000 gallons. A gallon meter on the line makes those totals easy to track. Slowing flow from the system is another sign the pre-filters are loading up. Turn off the water and release pressure before opening any housing. Use the filter wrench to loosen the clear housing, but tighten it back by hand only. Seat the new cartridge, then refill the housing slowly. In a Stealth-RO, power flush for two to three minutes after a carbon change and discard that water. Many city supplies now use chloramines, which this carbon block is not rated to remove. Water treated with chloramines calls for a carbon stage rated for chloramine removal. A quick call to your water utility tells you which disinfectant comes out of the tap.

Key Features

• Coconut carbon block: Standard carbon stage for Stealth-RO and smallBoy.
• Up to 99% chlorine removal: Also takes out sediment, rust and silt.
• 10 micron nominal: Rated at 1 GPM through the block.
• No carbon fines: Shorter rinse after installation.
• Greater dirt load: Holds more debris before flow drops.
• OEM part HL 22110: Keeps the Stealth-RO warranty intact.

Technical Specifications