Use a newly developed mesh material built to offer a unique combination of UV protection, filtering, superior strength, light weight and ultimate pool protection. Rugged-Mesh weighs almost 50% less than the typical solid safety cover. Mesh material's special weave allows water to drain while collecting finer debris keeping the pool water even cleaner. Rated at almost 100% shade using a standarad light box test, the amount of sunlight entering the pool is signifigantly reduced or eliminated, which in turn reduces algae growth. Designed for tougher, rugged areas, the Rugged-Mesh has increased abrasion resistance and tear strength and can be used in areas of rougher or sharp coping, raised areas or windier areas

US Patent No 6,886,187-99% Shade