... "K" impeller: Closed non-clogging impellerFor clear water, sewage, fluids containing solids and sludge which do not liberate gas."N ... " impeller: Closed multi-vane impellerFor clear water, fluids containing slight suspension such as treated sewage, screen water, pulp ... such as long fiber admixtures, sticky particles, etc.) and fluids containing air. ApplicationsThey can be applied to the city ...