Multi-Stage Filter System filters potable water.
Press Release Summary:

Designed for lakefront properties, small campgrounds, and trailer parks, multi stage filter system combines sub-micronic pre-filtration with advanced nanofiltration to remove dirt and sediment and reduce virus, bacteria, cysts, and other submicron particles. Features included are 222 housings, GIANT® 4½ in. O.D. cartridges, multi-stage brackets, NSF approved components and FDA-grade materials.
Original Press Release:
Multi-Stage Filter System
Keystone Filter's multi-stage systems are the ideal solution for filtering potable water at lakefront properties, small campgrounds and trailer parks. These high-end, low cost systems combine submicronic pre-filtration with advanced nanofiltration to provide outstanding removal of dirt and sediment and reduction of virus, bacteria, cysts and many other submicron particles. Features include Keystone's unique 222 housings, GIANT® 4-1/2" O.D. cartridges, multi-stage brackets, NSF approved components and FDA-grade materials.
For more information, visit our web site at www.keystonefilter.com or contact:
Keystone Filter,
Met-Pro Corporation,
2385 North Penn Road, Hatfield,
Pennsylvania 19440;
Telephone: (800) 822-1963;
FAX (215) 997-1839;
E-mail: filters@keystonefilter.com