Sludge pumping is one of the toughest applications for any pump. The product being moved varies in percentage of dry solids content and stickiness. Either sticky or fibrous sludge can cause flow restrictions within the pump hopper prior to entering the pumping elements, causing serious problems. Pumps from Xylem are trusted and reliable in sludge pumping because the compact pumps feature a vortex impeller to enable the passage of large solids, as well as solids concentrations of approximately 20% by weight. This makes the pumps ideal for moderately abrasive or stingy solids found in construction, mining, industrial and wastewater applications.