INCLUDES MASSAGE SHOWERHEAD CONSISTS OF HIGHLY EFFECTIVE, PATENTED KDF-55 (ZINC/COPPER ALLOY) AND CHLORGON FOR SUPERIOR CHLORINE PROTECTION. PERFORMS BEST IN WARM OR HOT WATER, UNLIKE CARBON FILTERS THAT ARE EFFECTIVE ONLY IN COLD WATER. CONTAINS 50% MORE FILTERING MATERIAL (16 oz) THAN MOST FILTERS, FOR A LONGER, MORE EFFECTIVE LIFETIME - 12 TO 18 MONTHS