The Ster-O-Tap Low Pressure Membrane technology removes bacteria and cysts - down to 99.9999999% (9 log). It strains down to 0.15 microns - the smallest know bacteria is 0.3 microns. It does this without the flow restriction of ceramic filters, and without constant cleaning!
It is replaced about every two years. It can be added to any existing filter or reverse osmosis system as a final treatment (it is recommended that a prefilter of 1 micron or less be used).
The Ster-O-Tap module kit includes the housing with Quick-Connect fittings for 1/4" tubing, and the Ster-O-Tap cartridge.