TOWER-FLO® Series TFH filters are available in three basic models, differentiated by filter vessel size in diameter inches: the TFH-18 TFH-24, TFH-30, and TFH-36. All TOWER-FLO® Series TFH self-contained filter plants shall consist of the following major components: base, pump, motor, strainer, facepiping, controls, and filter vessel. The filter plant shall be designed for a maximum filtration rate of 20 GPM per square foot of filter surface area and be shipped as a complete factory assembled and tested unit. Filter media shall be shipped with the unit for field installation.