Surface-type cartridge filters must be sized for a maximum filtration rate of 0.375 gallons per minute per square foot. An effluent pressure gauge and an air relief valve must be provided. A spare set of cartridges must be provided and available at all times.
19 SR 1419; 19 SR 1637
May 11, 2009
Official Publication of the State of Minnesota
Revisor of Statutes