Diatomaceous earth product

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Diatomaceous earth granulate comprises spray-drying a suspension comprising particles of diatomaceous earth, a liquid medium and a binder, wherein the inorganic solids in the suspension comprise at least 80 wt% diatomaceous earth; and recovering a diatomaceous earth spray-dried granulate. The recovered spray dried granule may be calcined at a temperature of at least 600 oC. The granule may also be formed into a shaped body prior to calcinations. Also disclosed is a granular diatomaceous earth product obtained by the method, which comprises substantially spherical granules each having a shell comprising diatomaceous earth surrounding a hollow core and a method of filtering a liquid which comprises passing the liquid through a filter comprising granules of spray dried diatomaceous earth, or a shaped body formed from granules of diatomaceous earth.