MULTICRETE™ II Filter Underdrain

The open plenum design allows a wide range of water only or combined air and water backwash rates. Often referred to as a false floor underdrain the thickness of the floor can be adjusted to meet downward and uplift requirements for a project. Media retaining or gravel support nozzles are installed once the concrete has cured and prior to filter media installation. Media retaining nozzle slot opening are sized according to media effective size to minimize headloss