Flow Clear Technology's Helix Screen filter models are available in three different sizes: 2”, 2” Super and 3” models. The filters can be installed in any orientation; however, it is preferable to install them  with the 3/4” flush port at bottom. As water enters the filter housing, a high velocity centrifugal action occurs, spiraling heavier particles (sediment, scale, etc.) away from the screen cartridge, down to the base of the filter. These accumulated particles are then flushed from the filter via the 3/4” flush port connection at the base of the filter (valve not included).