Brita Total360 Water Filtration Two Stage Under Sink Water Filter Replacement Set. Longer Lasting Filter: Brita Total360 Dual Stage Under Sink Water Filters last 6 months. Filter Replacements Made Easy: It takes seconds to install these filters into your current system and you don't have to turn off your water. Remove the old filters by simply twisting the cartridges to the left, then pulling down. The encapsulated design prevents water in the filter from spilling out upon release from the system. Screw in the new filters and run the water for several hours to flush the system. Certified to Reduce Contaminants: The National Sanitation Foundation (NSF) International has determined a standard for water filtration products that are made to produce better home water. This filtration system was tested and passed, earning its NSF International Certified label that proves it reduces contaminants that are commonly found in home water such as sediment, chlorine, volatile organic compounds, MTBE, cysts & lead.