Pebbles composed of sub-angular, durable and dense grains of predominately siliceous material. The range of Water Filter Gravel and Support Pebble that we offer, are spherical in shape and allows even distribution in support beds and good flow. Support gravel acts as a support for the filter media and forms the lower levels of the filter bed. Further, for supporting the media, the size needs to be calculated and the correct gradation is required. Water Filter Gravel or the Support Pebble is ideal for filtration as it provides high purity and consistent quality. Aqua pebbles are double washed, kiln dried, screened and classified into various sizes to meet different specifications with strict adherence to quality control.