The two ways to increase the lifetime of a filter are to increase the amount of contamination it can handle, or to improve the effectiveness of cleaning procedures. PEPLYN HD combines both of these capabilities in an advanced pleated construction. PEPLYN HD utilizes high depth pleated polypropylene media that balances high contaminant loading capacity with efficient cleaning. Capture of particles is throughout the depth of the media, larger particles being retained in the outer prefiltration layers, while the inner graded density PEPLYN media provides accurately defined retention under wide extremes of operating conditions. The lifetime of PEPLYN HD is enhanced by its ability to withstand frequent backwash cleaning.