Swimming Pool Sand - A Beginner's Introduction
The sand that lies underneath your pool is called "mason sand", while the sand for your filter is simply called "filter sand" or "silica sand". Mason Sand, For Your Pool's Base Mason sand, sometimes called mortar sand, can normally be found at any sand/gravel yard or masonry supply yard.
Pool School - Maintenance and Cleaning of Pool Filters
Maintenance and Cleaning of Pool Filters This article will discuss why maintenance cleaning is a good idea, then tell how to clean each of the 3 types of filters; cartridge (or cart), sand and finally both types of the Diatomaceous Earth (DE) filters.