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The Doulton W9221000 fits the following filter housings:
The Doulton W9221000 - OBE Imperial Super Sterasyl is a self-sterilizing ceramic filter candle with a three stage cartridge. This Doulton filter provides sub micron filtration for the reduction of fine particulate matter, bacteria, cysts, turbidity, chlorine taste & odor, VOCs, and industrial solvents. This Doulton ceramic filter is compatible for use in reverse osmosis guard and post filtration and UV systems.
Doulton W9221000 - OBE Imperial Super Sterasyl specifications: