30K & 40K In-line Muffin Monster

Legendary Performance Only a Muffin Monster® Sewage Grinder Can Provide

The 30K & 40K In-line Muffin Monster sewage grinders have been providing peace of mind to treatment plant operators and collections managers for over 45 years. Wastewater professionals repeatedly turn to a JWC sewage grinder for the ultimate sludge grinder solution to cut down troublesome solids.  It is ready for rags that can damage pumps, clog valves and foul treatment equipment – causing costly damage and excessive repairs.

The original 30K Muffin Monster is a workhorse of sludge grinder for biosolids processing systems. It covers flows from 450 to 2450 gpm (102-556 m3/hr). It has the ability to not only cut through rags and other solids in WAS and RAS but also precondition the sludge to give it a uniform consistency prior to digestion. The 30K units are also commonly installed within dry wells of pump stations to protect pumps from solids found in the collections systems.

The 40K Muffin Monster is the even stronger sewage grinder offering robust 2 ½” (64 mm) hex shafts, larger cutters. It also comes with a standard 10 HP (7.5 kW) drive motor.  The 40K is for the highest solids loading environments like prisons and combined sewer pump stations. Additionally, as a sludge grinder, it will excel in biosolids systems for larger treatment plants.

All dual shafted grinders have two rows of hardened steel cutters that rotate at slow speed and with incredibly high torque. These will grind down large solids into small particles. 30K Monsters are also available with Wipes Ready® Technologies which are specifically designed for shredding wipes and rags. Wipes Ready cutters shred rags and disposable wipes into small pieces that will not weave back together and form long ropes.

Sewage Grinder Benefits:

  • Sludge grinder to prevent damage or clogs in sludge processing pumps, centrifuges, and heat exchangers.
  • Prevents unplanned maintenance from sewage pump station clogs.
  • Preconditions sludge for improved performance in digesters.

Muffin Monster Features:

  • Dual-shafted, slow-speed, high-torque grinder easily shreds the toughest debris, including rocks, wood, wipes, hair, clothing, plastic and other debris.
  • 30K Monsters offers easy removable cartridge maintenance that allows for overhaul without removing the unit from the pipeline.
  • Wipes Ready® Technology available which prevents materials from forming long strips and reweaving in the waste stream.
  • Automated Monitoring and Controls to optimize performance and protect against jams.


  • 30K Units for pipelines up to 12” (305mm) and flows from 450 to 2450 gpm (102-556 m3/hr).
  • 40K Units for pipelines up to 20” (500 mm) and flows from 2700 – 6860 gpm (612-1558 m3/hr).

Monster Quick Ship

If you need your Muffin Monster fast, the 30K In-Line Muffin Monsters are NOW available with the Monster Quick Ship. Click here to learn more about Monster Quick Ship.