Reverse Osmosis helps to meet zero manifesting goals and comply with federal Resource Conservation and Recovery Act requirements, as well as state and local discharge regulations.
Low Maintenance
The Reverse Osmosis system is low maintenance with minimal operator involvement.
As part of the plant assessment, PRAB reviews operating costs such as electrical, water, cleaners, haul-away, manpower and regulatory compliance to get you the most value for your equipment.
Recycle and Reuse
The Reverse Osmosis System removes up to 99.5% of dissolved salts and virtually all colloidal and suspended matter from the most challenging waste and feed water applications- for recycle and reuse or dump to sewer.

Reverse Osmosis filtration effectively removes dissolved salts, colloidal and suspended matter.

Reverse Osmosis filtration removes up to 99.5% of dissolved salts and virtually all colloidal and suspended matter from the most challenging waste and feed water applications. This technology is typically used for industrial, metalworking, and surface treatment applications as a final process after ultrafiltration or chemical treatment of incoming water, process water, or industrial wastewater.

PRAB offers Reverse Osmosis (RO) systems for incoming water, process water and industrial wastewater treatment ranging in capacity from 1 gpm (1440 gpd) to 200 gpm (288,000 gpd). This process which removes up to 99.5% of dissolved salts and virtually all colloidal and suspended matter from the most challenging waste and feed water applications. Our RO filtration technology is typically used as a final process after ultrafiltration or chemical treatment of waste and feed water in industrial, metalworking, and surface treatment applications.

All industrial filtration equipment is built using components only with proven membrane technology that will provide reliable, long-term operation. PRAB RO systems arrive at your site fully tested and ready to clean contaminates from water. PRAB also provides the pretreatment equipment and chemistry required to ensure the optimal performance and lifespan of your RO membranes.

Reverse Osmosis (RO) is a filtration technology used to remove dissolved solids and impurities from water using a semi-permeable RO membrane which allows the passage of water but leaves the majority of dissolved solids and other contaminants behind. RO membranes require high water pressure (greater than osmotic pressure) to work effectively. Water that passes through the RO membrane is called permeate and the dissolved salts rejected by the RO membrane are called concentrate. An RO system that is properly designed and operated can remove up to 99.5% of incoming dissolved salts and impurities.

PRAB offers a complete line of pilot equipment that can be used to validate system operation and performance prior to purchase. Available pilot units include our tramp oil removal, centrifuges, ultrafiltration, vacuum distillation and Reverse Osmosis equipment. Pilot units are meant to act as a sample test to provide confidence that the recommended equipment will meet the output requirements of your application. Flow rates range from 2 gpm (2,880 gpd) up to 10 gpm (14,400 gpd).


Reverse Osmosis |

Below are a few example system flow diagrams featuring a Reverse Osmosis system. Each solution is customized to your unique application according to your goals and requirements.

Reverse Osmosis (RO) has become a widely utilized treatment process for many applications and particularly treatment of industrial and municipal wastewater. PRAB offers many RO Membrane arrangements for utilizing this advanced technology. Within the industrial sector we focus on improving incoming water, process water, and treatment of wastewater for reuse, and or discharge to your local POTW.

Reverse Osmosis Applications |


Industrial applications PRAB has participated in include boiler water, chemicals, metal working wastewater, surface treatment, plastics, paper & pulp, pharmaceutical, and food & beverage.

We approach each application as a new study and require completion of a data collection form to capture important information for analysis purposes thereby allowing us to recommend the correct RO arrangement for each project. Information required on the data collection form includes; pH, TDS, COD, BOD, operating temperature, Chloride, Ammonia, Oil & Grease, TSS, Sulfates, Ca, Mg, and Emulsified Oil & Grease. It is also always good to receive a complete laboratory analysis of the wastewater prior to our recommended RO equipment strategy.

Reverse Osmosis has proven capable of removing most dissolved solids in water or wastewater by pressing the incoming feed water through a semipermeable membrane. The solids can include a range of ions, metals and very limited suspended solids. RO reverses a natural process known as osmosis, which is the act of passing molecules through a membrane from a less concentrated solution into a more concentrated one, equalizing concentrations for the solutions on each side of the membrane.

Pretreatment is important when working with reverse osmosis membranes due to the nature of their spiral wound design. These membranes are engineered in such a fashion as to allow only one-way flow through the system. As such, the spiral wound design does not allow for back-pulsing with water or air agitation to scour its surface and remove solids. Since the accumulated material cannot be removed from the membrane surface systems, they are highly susceptible to fouling (loss of production capacity). Therefore, pretreatment is a necessity for any Reverse Osmosis System.

PRAB offers several pre-treatment options including pH adjust, particulate filtration, activated carbon and other multi-media filters. We also find in certain applications Microfiltration, Ultrafiltration, and in some cases, biotreatment are becoming popular and necessary for RO pretreatment.

All these pre-treatment options will assist in making your RO system run more efficiently and prolong membrane life.

As we further investigate each application its important to know that PRAB mitigates risk by performing lab test and analysis with each prospect’s water / wastewater sample. These tests take place at our Kalamazoo office followed by independent analysis at Certified laboratories.

Once we are sure of the RO system design we create an in-depth proposal for review that includes a clear scope of supply with analysis data included based on the test samples run. What this means to our customers is a complete understanding of the project scope, costs, and assumptions made during the testing and proposal process.

Full Spectrum Industrial Wastewater Recycling and Reuse. Cost Reduction, Waste Minimization & Environmental Compliance.


  • Motivations for Reuse
  • Regulatory Overview
  • Wastewater Minimization Techniques
  • Wastewater Treatment Technology Evaluation
  • Intro to Membrane Filtration Technology
  • Intro to Vacuum Evaporation Technology
  • Case Studies
To discuss your custom application

Top Content

White Paper: Green Engineering

Green Engineering How to Design More Profit into the Metalworking Operation By Ron Chapman, Systems Sales Manager & Teresa Phillips, Senior Marketing Specialist, PRAB   Introduction The green movement is not a new concept. In fact, the basic principles were well-known throughout Europe in the medieval era. However, it was the Industrial Revolution in Europe that […]

August 9, 2019
Product Brochure: PRAB Fluid Filtration Solutions

Product Selection Chart Model # Flow Filtering Efficiency Application Tramp Oil Separator 3-150 gpm (11-568 lph) Coolant Guardian Coolant Recycling Systems 90-1,500 gph (341-5,678 lph) Coolant High Pressure Coolant Filters Coolant Magnetic Separator 5-265 gph (19-1,003 lph) 50-100 micron Coolant Paper Bed Filter 5-250 gpm (19-946pm) 15-50 micron Coolant/Wastewater Magnetic Separator & Paper Bed Filter 5-265 […]

August 30, 2019
Product Brochure: PRAB Builds Equipment for the Toughest Jobs in Manufacturing and Metalworking

“We get $0.17 per pound more for our briquetted material over loose chips.” – Jack Rovan, Martin-Baker Plant Manufacturing Manager Proven Results Achieved for PRAB Customers: Documented reduction of scrap volume by as much as 90% Increased scrap value up to 25% Reclaimed up to 99% of cutting fluids “We have seen around […]

May 21, 2019