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Peace-of-mind Sewage Grinding for the Highest Solids Loading Environments

40K Open-channel Muffin Monster sewage grinders have been providing peace of mind to sewage collections and treatment plant operators since 1973. These grinders reduce troublesome solids that can clog pumps, valves and treatment equipment causing costly damage and excessive repairs.

The 40K Open-channel Muffin Monster delivers enhanced sewage grinding performance over the 30K model. 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 pumps stations.

40K Open-channel Muffin Monsters fit within wastewater channels or can be affixed onto wet well walls at pump station inlets. In wet well installations, stainless steel mounting frames are custom designed and fabricated to meet the installation’s needs.

Meadowlark Inlet Inline 40K


  • Prevents unplanned equipment maintenance at pump stations with high solids loading
  • Eliminates emptying pump station trash baskets, reducing manual labor along with the related odors from collected solids waste
  • Keeps pumps and valves clear and operating efficiently to minimize maintenance costs, shorten run cycles and reduce energy consumption
  • Separates organic material from debris for cleaner screenings


  • 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
  • Custom frames for easy channel or wet well installation
  • Smart controller with load sensing control system optimizes performance and protects against jams


  • Fits channels up to 20 inches (508 mm) wide
  • Handles flow rates from 915 – 2,100 gpm (207 – 4 77 m3/hr)