Designed for today’s most demanding installations, the Crystal Water D.E. Filter sets the standard of performance and features for pool filters. The only D.E. filter on the market with 2 1/2″ internal piping, improves flow and reduces system noise when using 2 1/2″ or 2″ plumbing. With the 2″ bottom clean out port, the Crystal Water D.E. Filter will provide years of trouble-free operation and crystal clear, sparkling water.