Prefilters are installed on-line to clean all tap water in the appartment or a house.

Prefilters (2¹/₂" x 10") use regular 5 and 20 micron melt blown polypropylene cartridges. These cartridges remove turbidity, rust and suspended solids.

Viking prefilters (5¹/₂" x 20") use composite carbon block cartridges. These cartridges remove turbidity, rust, dissolved iron, suspended solids and organics.