Home Products and services Specialist Sands Filtration Sand and Gravel Filtration sand and gravel Aggregate Industries produces specialist silica sand for varied applications within the water filtration market. Rapid Gravity Filter Sand & Gravel Garside filtration sands and gravels are used in many types of filter including rapid gravity filters due high to the silica content and cleanliness. Rapid Gravity Filter Swimming Pool Filter Sand & Gravel Filter media’s sub-angular to rounded grain shape allows for the effective removal of suspended particles in both domestic and commercial swimming pool filters. Swimming Pool Filter Slow Sand Filter The sub-angular to rounded grain shape, petrological composition, high silica content and cleanliness make our sands ideal media for water filtration. Slow Sand Filter