http://www.waterfilters.net/Pentek-DGD-2501-Water-Filter.html
The Pentek DGD-2501 water filters have two separate gradient density layers that enhance cartridge performance. The Pentek DGD-2501 filter cartridge has a 25 micron pre-filter fine sediment water filter layer and a 1 micron post-filter extra-fine sediment water filter layer. The larger diameter of the pre-filter reduces the particle load to the post filter, allowing it to operate at higher velocities. The effective DGD-2501 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. This reduces the need for multiple housing step-down filtration systems. The DGD-2501 filter cartridge reduces extra-fine dirt, sand, sediment, silt, rust particles, and scale particles.
The Pentek DGD-2501 water filters are manufactured from a pure polypropylene that is resistant to chemicals and corrosion. The Pentek DGD-2501 water filter has three times the dirt-holding capacity of similar sized sediment water filter cartridges and is ideal for all residential, rural, commercial, industrial, and municipal applications.
