Hobart 01-294225-101 Replacement Carbon Pre-Filter Cartridge (RO-I & RO-S)The Hobart 01 294225 101 is a genuine replacement carbon pre filter cartridge for the Hobart Hydroline RO I and RO S reverse osmosis units. Regular cartridge replacement ensures optimal membrane protection and water quality. Key Features Genuine Hobart replacement cartridge for Hydroline RO I and RO S Carbon pre filter removes chlorine and particles to protect the RO membrane Regular replacement maintains water quality and extends membrane life Easy