Patent ID: 7297263

Claim:
A mixture for forming a porous composite block for a water treatment block filter comprising; (a) a first carbon material having a first grain size between about 100 μm and 200 μm; (b) a second carbon material having a second grain size between about 1 μm and 70 μm; (c) a binder; (d) wherein the first carbon material, the second carbon material and the binder are formed as a mixture; (e) wherein the first carbon material and second carbon material are different from one another and are selected from the group consisting of activated natural carbon and carbonaceous organic contaminant scavenger; (f) wherein the first carbon material is between about 35-45% volume; (g) wherein the second carbon material is between about 10-30% volume; and (h) wherein the binder is between about 30-50% volume.