Patent ID: 8607992

Claim:
A ceramic filter comprising: (a) from about 75% to about 87% by weight of diatomaceous earth; (b) from about 10% to about 20% by weight of a flux; and (c) from about 0.03% to about 0.4% by weight of a metallic compound, the metallic compound being selected from chromium, manganese, cobalt, nickel, copper and/or zinc; the percentages by weight being percentages by weight of the ceramic filter, wherein the ceramic filter has an internal honeycomb structure having a flow rate of spiked water of at least about 1 liter/min at 10 kPa; wherein the internal honeycomb structure is obtained by burning off a bulking agent by firing a precursor filter, the precursor filter comprising from about 8% to about 30% by weight of the bulking agent, the bulking agent being selected from hemp, cotton, flax, silk, wool, or cellulose, or a combination thereof.