The 20 single system is a versatile filter system. The filter housing comes in your choice of 3/4", 1" or 1 1/2" connections and accepts all popular jumbo and big blue 20• cartridges. It comes with your choice of pleated, melt blown or string wound sediment filter ifrom 1-50 microns. This is the correct size filter housing to install on a whole house. Frequently we get customers who have installed a 10• slimline filter housing on the whole house and have to change the sediment filter once a week due to the fact that the slimline systems are too small for a whole house. This system will have seven times the flow and capacity versus a 10• slimline system. Pictured with optional stainless steel bracket.