Patent ID: 7740141

Claim:
A method of making a granular media water filter, the method comprising: providing binder particles of 100-500 U.S. mesh size and having melt index of less than or equal to 1 g/10 min; providing particles of material active for fluid treatment of 100-500 U.S. mesh size; providing no particles larger than said binder particles and said particles of material active for fluid treatment; mixing together only said binder material and said particles of material active for fluid treatment; heating the resulting mixture to a temperature in the range of about 275-500 degrees F. to soften said binder particles so that the material active for fluid treatment adheres to the binder particles to form a plurality un-sized granules; obtain a plurality of separate granules by sizing the plurality of un-sized granules to a range of 75 microns up to about 4700 microns and separating any greater-than-1700-micron granules into more than one 250-1700 micron granule so that said plurality of separate granules are in the range of 75-1700 microns in diameter; cooling said plurality of separate granules after said sizing; and loading said plurality of separate granules into a filter vessel for filtering water through said plurality of separate granules; and wherein the method comprises no step of compression of said binder particles and said particles of material active for fluid treatment.