Description
SMALLBOY KDF CATALYTIC CARBON FILTER UPGRADE is the replacement and upgrade filter cartridge for the SmallBoy water treatment system, incorporating KDF (Kinetic Degradation Fluxion) media alongside activated carbon for enhanced water purification beyond what standard carbon-only filters provide. We have been recommending water treatment solutions to UK growers since 2017 because input water quality is the foundation of consistent nutrient management — and in areas of the UK with heavily treated or high-mineral water, a quality carbon block or KDF filter can make a substantial difference to growing results.
What KDF Media Adds to Carbon Filtration
Standard activated carbon filters are excellent at removing chlorine and organic compounds from tap water, but they have limited effectiveness against heavy metals, chloramine (the alternative disinfectant used in many UK water supply areas), and dissolved mineral scale precursors. KDF media is an alloy of copper and zinc granules that works through an electrochemical oxidation-reduction process, converting chloramine into harmless nitrogen and chloride compounds, precipitating dissolved heavy metals onto the KDF surface, and inhibiting the growth of bacteria and algae within the filter housing. The combination of KDF and carbon in the SmallBoy upgrade cartridge addresses a broader range of water contaminants than carbon alone — particularly relevant for growers whose tap water uses chloramine rather than chlorine.
Installation and Replacement Schedule
Replace the SmallBoy filter cartridge every three to six months depending on usage volume and input water quality — higher mineral content and usage volumes require more frequent replacement. When flow rate through the filter reduces noticeably, the filter is approaching end of media life. Install the upgrade cartridge in the SmallBoy housing according to the standard replacement procedure, ensuring the O-ring seals are seated correctly before reconnecting the water supply to prevent bypass leaks around the cartridge.
Use the SmallBoy KDF Catalytic Carbon Filter Upgrade alongside the SmallBoy De-Chlorinator housing for a complete water treatment system that removes chlorine, chloramine, and heavy metals from your growing water supply.







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