STAGE 1 FILTER: 100% ACTIVATED ALUMINA: UP TO 95% REDUCTION OF FLUORIDE. STAGE 2 FILTER: KDF55 COMBINED WITH CATALYTIC CARBON FOR REDUCTION OF FOLLOWING: KDF55: HEAVY METALS SUCH AS (LEAD, MERCURY, NICKEL), CHLORINE, ACTS AS A BACTERIA AND SCALE CONTROL MEDIA. CATALYTIC CARBON: IRON, HYDROGEN SULFIDE, MANGANESE, CHLORAMINES REDUCTION. IMPORTANT INSTALLATION DETAILS: DIMENSIONS: 10" LENGTH x 12" HIGH x 5" WIDE WATER FLOW THROUGH FILTER = STAGE 1 IN & STAGE 2 OUT FLUSH WITH 4 GALLONS OF WATER BEFORE USING AVERAGE LIFE OF FILTERS IS 12 MONTHSCARTRIDGES SHOULD BE REPLACED ONCE PER YEAR OR REPLACE IF FLOW BECOMES SLOW