BK50-P100200 Semi-open Impeller Stainless Steel Centrifugal Pump High Flow Rate Uses. The biggest feature of this pump is semi-open impeller. It can pass through solid impurities up to 14mm in diameter, especially suitable for various circulating cleaning systems of production lines, such as supporting dishwasher rinsing Sterilization of tableware Fish pond sewage conveying, textile factory printing and dyeing pool, soy sauce factory soybean milk conveying, etc.