ve ASSEMBLY INSTRUCTIONS ZERO FOR REPLACEMENT FILTERS 4 AVAILABLE PACK SIZE: Fits All Zero Water Pitchers and Dispensers 1 UNWRAP FILTER Remove and discard blue cap. 2 TWIST filter into the bottom of reservoir (from below) and tighten filter to obtain a complete seal with the reservoir. Do not drop the filter in from above. Tighten until there is a complete seal between the filter, o-ring and reservoir.