ELKAY EZH2O & HALSEY HYDROBOOST REPLACEMENT FILTER FOR WATER REFILLING STATION & WALL MOUNTED UNITS FOR USE WITH FILTERED EZH2O HYDROBOOST BOTTLE FILLING STATIONS AND FILTERED ELKAY & HALSEY WALL MOUNT UNITS. REMOVES CYSTS LIKE CRYPTOSPORIDIUM AND GIARDIA LEAD PARTICLES AND CHLORINE. REDUCES ODORS AND DISCOLORATION FROM INCOMING WATER. PLEASE NOTE THAT THIS IS A REPLACMENT FILTER FOR ELKAY WALL MOUNTED PUSH-BAR ACTIVATED UNITS ONLY AND SHOULD BE USED TO REPLACE AN EXISTING FILTER. TO INSTALL A FILTER IN A NON-FILTERED UNIT A FILTER KIT MUST BE PURCHASED. NEW FILTER CAN BE USED TO REPLACE ELKAY MODEL 51299C.