Thetys Pumps SRL
Tel: +40 744 595 445
Str. Teheran, nr. 11, sector 1,
011931 Bucuresti, Romania

Because life is fluid.


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Muffin Monster™ inline/open channel grinders – Thetys Pumps
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Muffin Monster™ inline/open channel grinders

Thetys Pumps / Products  / Solids reduction, separation and removal systems / Muffin Monster™ inline/open channel grinders

Muffin Monster™ inline/open channel grinders

Monsters keep wipes away

Muffin Monster™ sewage grinders represent the best-in-class technology for wastewater solids reduction. With over 35000 installations, the proven capabilities of the Muffin Monster is legendary in providing solutions for the ever more stringent operational needs arriving throughout the industry.

Main benefits
Dual-shafted grinder
  • Dual-shafted, slow-speed, high-torque grinder easily shreds the toughest debris, including rocks, wood, wipes, hair, clothing, plastic and other debris
  • Capable of grinding a wider variety of solids than single-shafted machines, macerators, or chopper pumps
  • Grinding separates organic from inorganic materials in the waste stream
Automated monitoring and controls
  • Protect pumps and other critical equipment from costly clogs and damage from tough solids
  • Auto load sensing and reversals reduce interrupts and optimize performance
Wipes Ready™ technology
  • Wipes Ready Technology available which prevents materials from forming long strips and reweaving in the waste stream
Compact and efficient design
  • Adapts to pipelines or channels with little or no modification
  • Custom stainless-steel frames allow easy installation in channels, wet wells and pump stations
  • Inline 30K Muffin Monster™ offers easy removable cartridge maintenance that allows for overhaul without removing the unit from the pipeline
Lower operating cost
  • Clear pipes and pumps means shorter pump run cycles and lower electrical costs
Main applications

The Muffin Monster™ sewage grinders are designed to protect pumps and other equipment by grinding down the toughest wastewater solids. Available in three different models each with two different configurations, they are suitable for applications such as:

  • Pump stations
  • Sludge processing
  • Correctional facilities
  • Headworks – primary treatment
  • Septage/Grease receiving
  • Airports
Wipes Ready™ Technology

Muffin Monster sewage grinders are available with the unique Wipes Ready™ suite of technologies. It is designed to capture all wipes in the waste stream and shred them into small pieces that will not reweave into a ragball in sewage systems.

The Wipes Ready technologies applied in Muffin Monster sewage grinders are:

  • Wipes Ready cutters* – A combination of serrated cutters and knurled spacers cuts wipes in two directions. The result is smaller particles that cannot reweave downstream.
  • Delta P side rails* – Direct solids into the cutters without sacrificing flow rate and prevent debris build-up in the grinder
  • Optimized cut control (OCC)* – The OCC gear ratio optimizes shaft speeds to enhance the cutting action and cleaning of the cutters, which in turn improves the performance and life of the grinder.

Please note that different Muffin Monster models feature different Wipes Ready options.

* Patent pending

Muffin Monster™ 10K series

The 10K Series Muffin Monster is a compact grinder, tough on solids in sludge and sewage applications. It fits into areas with limited space requirements while still providing the necessary power for downstream protection. The 10K Series is an ideal, low-cost solution that goes beyond sludge grinding at resource recovery facilities. It fits perfectly into office buildings, apartment complexes, resorts, retails centers and package treatment plants.

  • Hex shafts: 50 mm
  • Motor: Standard 1.5 kW; 25:1 reducer
  • Cutter size: 120 mm diameter
  • Seal max working pressure: 6 bar

Inline model

Inline model Flow rate (1) m3/hr Pipeline size mm Pressure drop bar
10000-B100-DI 62 100 0.03
10000-B150-DI 125 150 0.09
(1) 0-2% solids

Open channel model

Open channel model Flow rate (2) m3/hr Head drop mm
10002-0008-DI 41.4 146
(2) Flow based on optimum channel conditions.
Muffin Monster™ 30K series

Troublesome solids are now easier than ever to reduce with the Muffin Monster dual-shafted grinder. Its slow speed, high-torque design shreds tough solids that typically cause sewer problems. The 30K Muffin Monster is available as both inline and open channel configurations.

  • Hex shafts: 50 mm
  • Motor: Standard 2.2 kW; 25:1 reducer
  • Cutter size: 120 mm diameter
  • Seal max working pressure: 10.3 bar

Inline model

Inline model Flow rate m3/hr Pipeline size mm Pressure drop bar
30004T-B100 102 100 0.04
30004T-B150 159 150 0.08
30004T-B200 250 200 0.21
30004T-B250 386 250 0.20
30004T-B300 556 300 0.40

Open channel model

Open channel model Flow rate (1) m3/h Head drop mm
30005-0012 141 290
30005-0018 223 405
30005-0024 311 405
30005-0032 477 445
30005-0040 686 495
30005-0060 1277 760
(1) Flow based on optimum channel conditions.
Muffin Monster™ 40K series

The 40K Series Muffin Monster excels in wet and dry grinding applications. It is a powerful shredder for large processing systems. It also serves in many industrial applications including fish and beef processing, petroleum, pulp and paper mills, chemical plants, and recycling plants.

  • Hex shafts: 64 mm
  • Motor: Standard 7.5 kW; 35:1 reducer
  • Cutter size: 190 mm diameter
  • Seal max working pressure: 10.3 bar

Inline model

Inline model Flow rate m3/hr Pipeline size mm Pressure drop bar
40002-18B300 612 300 0.24
40002-24B400 999 400 0.15
40002-24B450 1249 450 0.23
40002-32B500 1558 500 0.29

Open channel model

Open channel model Flow rate (1) m3/hr Head drop bar
40002-0018 207 203
40002-0024 327 406
40002-0032 477 457
(1) Flow based on optimum channel conditions.


7,11,13 and 17* tooth options

* Wipes Ready™ serrated cutters




  • IP55 TEFC Motor, standard
  • IP55 TEFC Motor for ATEX: (Ex d IIC T4), optional
  • IP68 Immersible Motor ATEX: (Ex de IIB T4), optional
  • IP55 Integrated drive, 10K only


Smart controller

  • Load-sensing control system automatically reverses to clear jams

Custom frames

Smart controller
  • Stainless steel frames for easy installation
Wipes Ready™ feature availability

10K in-line

Muffin Monster

10K open channel

Muffin Monster

30004T in-line

Muffin Monster

30005 open channel

Muffin Monster

17 tooth Wipes Ready cutters* Optional Optional Optional Optional
Delta P side rails* Yes
Optimized cut control* Yes Yes Yes Yes
* Patent pending

Data sheets


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