Big Foot Guzzler 40G Suction Filter With Filter Media 40 Gpm 2 in. Fipt With 6 in. Screen. Big Foot Filters are designed to be used as an initial filter on the suction side of a pump using surface water sources. The 40G and 80G, rated at 40 gallons per minute and 80 gallons per minute respectively, are made of heavy duty PVC plastic. Extra large intake areas will require little or no service during the pumping season and will give many years of trouble free service, even under the most severe conditions.