Jul 17, 2019 · HTH filter sand works with all sand filters on pools and spas of all sizes. HTH pool filter sand is the purest, most closely sized pool filter sand available thanks to a rigorous washing and grading process. Follow your filter manufacturer's recommendations for filling a new filter or for replacing sand .
Vitreous Silica is the generic term used to describe all types of Silica glass, and manufacturers refer to the Material as either fused quartz or fused Silica. Fused quartz is manufactured by melting naturally occurring crystalline Silica, such as sand or rock crystal. The production method is either electrically fused or flame fused.