1.RO water purifier system 2.PP+UDF+CTO+RO+T33+Mineral/UV 3.Under Sink 6 stage ro water purifierr StageFilterFunctionService life1stPPremove the particles, dust, mud, etc4-6 months2ndGAC/UDFremove the chlorine, odor smell, organics, turbidity etc.4-6months3rdCTOremove the chlorine, odor smell & suspending particles4-6months4thRO membraneremove the bacteria, heavy metal, salt, bad mineral ...