The Pentek DGD-7525 water filters have two separate gradient density layers that enhance cartridge performance. The Pentek DGD-7525 larger diameter of the prefilter reduces the particle load to the postfilter, allowing it to operate at higher velocities. The effective DGD-7525 filter depth is increased to a full 233% of standard spun-polypropylene or string-wound filters. This increased depth provides for very high particulate reduction efficiencies and added loading capacity. The Pentek DGD-7525 water filters reduce the need for multiple housing step-down filtration systems. The Pentek DGD-7525 filter cartridge reduces extra fine dirt, sand, sediment, silt, rust particles, and scale particles. The Pentek DGD-7525 water filters are pure polypropylene construction resistant to chemicals and corrosion. The Pentek DGD-7525 replacement filters are designed for purity, bacteria resistance, and chemical resistance. The Pentek DGD-7525 water filter cartridge will not add taste, odor, or color to the liquid being filtered. The Pentek DGD-7525 water filter has three times the dirt-holding capacity of similar sized sediment cartridges. The Pentek DGD-7525 water filter is ideal for all residential, rural, commercial, industrial, and municipal applications. The Pentek DGD-7525 filter cartridge has a 75 micron fine sediment prefilter layer and a 25 micron extra fine sediment postfilter layer.