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Legendary Muffin Monster Performance Scaled for Today’s Highest Solids Loading Environments

40K In-line Muffin Monster sewage grinders have an established history of delivering peace of mind to treatment plant operators and collections managers. These are the ultimate sludge grinding solution wastewater professionals turn to when facing troublesome solids.

The 40K In-line Muffin Monster provides enhanced sewage grinding capabilities over its 30K sibling. Engineered with robust 2 ½” (64 mm) hex shafts and larger cutters, it also comes standard with a 10 hp (7.5 kW) drive motor. The 40K is designed for the highest solids loading in high-flow environments like prisons and combined sewer pump stations. Additionally, it excels in biosolids systems as a sludge grinder for larger treatment plants.



  • Protects sludge processing pumps, centrifuges, and heat exchangers from damage and clogs requiring costly repairs
  • Prevents unplanned equipment maintenance at pump stations and headworks with high solids loading
  • Preconditions sludge for improved performance in digesters


  • Dual-shafted, slow-speed, high-torque grinder easily shreds the toughest solids, including rags, rocks, wood, wipes, hair, clothing, plastic and other debris
  • Helical cutter stacks of individual, hardened, alloy steel cutters efficiently grab and shred solids with scissor-like precision
  • Smart controller with load-sensing control system optimizes performance and protects against jams


  • Fits pipelines 12 – 20 inches (300 – 500 mm)
  • Handles flow rates from 2,700 – 6,860 gpm (612 – 1,558 m3/hr)