THE OXYAURA COMPACT 200 FILTER RESIN BONDED CARTRIDGE (RBC FILTER) IS PRODUCED FROM CELLULOSE FIBERS, WHICH HAVE BEEN INTRINSICALLY BONDED TOGETHER BY A MELAMINE RESIN TO CREATE A SOLID THAT IS HIGHLY DURABLE AND HAS POROUS STRUCTURE. IT IS A MICRON FILTER WHICH REMOVES DIRT, DEBRIS AND EVEN MICROSCOPIC PARTICLES LIKE E. COLI, VIBRIO. CHOLERA ETC. FROM WATER. THE PORE SIZE OF A FILTER CARTRIDGE IS MEASURED IN MICRONS. THE SMALLER THE MICRON RATING, THE FINER THE PARTICULATE REMOVED. IT INSERTED INTO HOUSING AND CAN BE USED TO REMOVE PARTICLES OR CHEMICALS FROM THE WATER. BEST FOR MUNICIPAL TAP WATER. ALSO CAN INSTALL IN VILLAGES WHERE THERE IS A PROBLEM OF ELECTRICITY. ZERO ELECTRICITY - ZERO WASTAGE.