Watson-Marlow's heavy-duty hose pump can reliably handle many harsh materials, including grit-filled sludge, dependably for long periods of time. Peristaltic hose pumps are self-priming, dry running and virtually maintenance-free, with no expensive seals to replace, no check valves to clog, and no rotors and stators to wear out. Unlike other pump types such as gear pumps, diaphragm pumps and progressive cavity (PC) pumps, the highly abrasive nature of sludge does not affect peristaltic hose pump life. Every Watson-Marlow peristaltic pump is an inherent metering and dosing pump with repeatability at 99.5%. Many models include digital drives and displays in washdown enclosures.