Whole House Water Treatment Systems are available as 10″ and 20″ “Single”, “Dual” and “Triple” Stage Units. These are Point of Entry (P.O.E) Units, that are installed in homes & cottages to treat water for more than one water outlet. Mounting brackets, ball shutoff, and check valves come installed in these units, providing for easy installation and maintenance of units. Larger 10″ & 20″ lengths and 4-1/2″ diameter sediment & media filters (as per water treatment needs) are used in the Whole House Water Treatment Systems Large size, all polypropylene made housings in these units allow for greater filter capacities and larger flow rates than are possible with standard size systems. Flow rates range up to 40 GPM with little pressure drops. Polypropylene housings offer excellent compatibility with water, beverages, syrups, and a broad range of chemicals. Filters are sold separately.