This 7" 105 SqFt Pentair Clean and Clear Plus 420 and Waterway™ Crystal Water Pool Cartridge Filter removes particles and debris from water, allowing for a cleaner environment. It features a strong injection-molded core. Break resistant bands are strategically placed to support the media and maintain pleat spacing. Robust end caps are made from a time-tested chlorine and mildew-resistant urethane system.