CulliganHD-950A1NEW6.751" Jumbo, Heavy Duty Whole House Sediment Water Filter, Install Easily On 1" Main Water Lines, 4 Times The Capacity Of Standard 10 Filters, High Flow, Heavy Sediment Capabilities With Minimal Pressure Drop, Includes Housing Wrench, Use With Spas, Hot Tubs, Wells, Trickle Irrigation, Farm Uses and Other Commercial/Indus Or Industrial Applications, Replacement Cartridges Include Model #CP5-BBS-D True Value #529-336 Or Model #R50-BBSA True Value #852-582, Cartridges Sold Separately.