Multiple Effect Still

Paul Mueller Company Pyropure multiple effect stills (MES) are the simplest, most reliable means of producing pyrogen-free water-for-injection (WFI) that meets all the U.S. Pharmacopoeia (USP) requirements.

Our multiple effect stills have a simple, robust design that minimizes moving parts. This design minimizes maintenance and downtime, ensuring that your facility has water-for-injection when it is needed. 

We have eleven sizes of units, each with different numbers of effects, ranging from 90 gph to 3,700 gph, to ensure that you can find the right size for your facility. 

Defining Features

  • Simple, reliable, and efficient
  • Our MES is efficient because the system recovers the latent heat of vaporization occurring within its own process to heat feedwater and uses feedwater as its primary source of cooling
  • With absence of moving parts, the PyroPure MES requires less maintenance and is much quieter than mechanical compression stills


  • Condenser
  • Controls
  • Steam Separator
  • Preheaters
  • Evaporator
  • Product and feedwater analyzer
  • Start-up services utilizing a factory-based service technician
  • Comprehensive documentation package.

Optional Features:

  • Feedwater pump system
  • Pure steam option
  • Stainless steel sheathing and frame

Specifications and Sizing

Model No. Capacity
MES 6009-3 90 341 113x62x40 287x157x102
MES 6015-3 165 625 114x62x40 290x157x102
MES 6015-4 150 568 114x75x40 290x191x102
MES 6015-5 140 530 114x88x40 290x224x102
MES 6032-4 305 1154 112x80x45 284x203x114
MES 6032-5 275 1,041 112x94x45 284x239x114
MES 6032-6 240 908 112x108x45 284x274x114
MES 6040-5 400 1,514 112x94x45 284x239x114
MES 6040-6 390 1,476 112x108x45 284x274x114
MES 6064-4 630 2,385 128x100x52 325x254x132
MES 6064-5 600 2,271 128x119x52 325x302x132
MES 6064-6 500 1,893 128x138x52 325x351x132
MES 6076-5 690 2,612 131x119x52 333x302x132
MES 6076-6 660 2,498 131x138x52 333x351x132
MES 6110-5 1,100 4,163 136x147x53 345x373x135
MES 6110-6 1,070 4,050 136x168x53 345x423x135
MES 6140-6 1,300 4,921 151x184x58 384x467x147
MES 6175-6 1,810 6,852 180x184x58 457x467x147
MES 6200-6 3,200 12,112 155x209x64 394x531x163
MES 6300-6 3,700 14,004 188x192x64 478x488x163



Replacement Parts

Replacement parts for your Pure Steam Generator are available by calling our PyroPure parts specialists at 1-800-MUELLER ext. 9758 or +1 (417) 575-9758 or using the form below.

Mueller PyroPure service technicians are available for routine maintenance activities, system troubleshooting, or full overhauls. Contact the PyroPure service department at 1-800-MUELLER or using the form below.


Finding the right equipment that fits within your budget can be daunting. At Paul Mueller Company, we understand your needs. That’s why we offer Leasing options that give you more flexibility.

Tell us more about your needs.