Mystic White II is the descriptive name chosen to identify this exceptionally high-quality swimming pool filter sand.It's a special grade of pure white quartz sand that meets and exceeds the most exacting recommendations and specifications of major sand filter manufacturers Features. Larger diameter than play sand and has a mixture of white and off-white granules. Angular shaped grains entrap contaminants, increase the flow rate and clean easily during backwash. Filters everything from dirt, dust, leaves and algae, to small stones, oil, cosmetics and hair. Carefully screened and graded to prevent clogging. Permits even flow-rate with no balling, packing or channeling. Ecologically safe, odorless and chemically inert. Will not stain or corrode filter equipment. Designed for use with residential above ground and inground pools, and commercial inground pools. Made in the USA Weight: 50 lb bag