A pump and motor unit must be provided for the recirculation of water that has been selected to meet the quantity of water required for filtering, and cleaning the filter, with the total dynamic head developed by the complete system. It is recommended the pump comply with requirements of NSF Standard 50, "Circulation System Components and Related Materials for Swimming Pools, Spas/Hot Tubs," of the National Sanitation Foundation (NSF) and bear the NSF seal.
Idaho Admin. Code r. 16.02.14.254