Product Description Product Description The HD-950A Large Volume whole house system has four times the capacity of standard duty filter systems. Included with the unit is a SW-3A housing wrench, pressure relief valve. From the Manufacturer Culligan's Heavy-Duty HD-950A sediment housing has two times the capacity of standard 10-inch filters. It is ideal for private wells, large homes, farms, swimming pools, and spas and can extend the life of washing machines, water heaters, and other water-using household appliances. It has a 1-inch inlet/outlet for installation on main cold-water line and includes a housing wrench for filter installation. The unit come with a 5-year limited warranty. The HD-950A housing uses filter cartridges (R50-BBS, CP5-BBS, RFC-BBS) sold separately. From the Manufacturer Culligan's Heavy-Duty HD-950A sediment housing has two times the capacity of standard 10-inch filters. It is ideal for private wells, large homes, farms, swimming pools, and spas and can extend the life of washing machines, water heaters, and other water-using household appliances. It has a 1-inch inlet/outlet for installation on main cold-water line and includes a housing wrench for filter installation. The unit come with a 5-year limited warranty. The HD-950A housing uses filter cartridges (R50-BBS, CP5-BBS, RFC-BBS) sold separately.