NFT pumps pass German university testing 26 April 2021 The report stated that the efficiency of the pump was around 75% and the hydraulic efficiency of the wet end was around 71%. (Image: NFT) Tests carried out by the Fluid Mechanics, Acoustics and Fluid Machinery (SAM) Institute at the Technical University Kaiserslauten have confirmed that Supa-Stelth pumps from Brisbane-based New Fluid Technology (NFT) are among the most energy efficient pumps available with an exceptionally high NPSH. The report tested the performance of the Supa-Stelth pump for its efficiency and net positive suction head (NPSH). The NPSH level shows how well a pump resists cavitation, one of the major reasons for pump failure and maintenance issues for companies.