Corrosion-Resistant Products for Superior Life and Dependability


Industry Leading Value

With over 40 years of experience in the Reverse Osmosis/Desalination industry, Cat Pumps® has developed a reputation as the industry leader in high-pressure positive-displacement pumps. Our extensive line of 316 and Duplex stainless steel pumps offer unsurpassed corrosion-resistance, strength and long life, even in the harshest environments. Our positive displacement design offers 85-95% efficiency. Our pump design also provide easy field service requiring only standard tools, with parts available worldwide. With field-proven dependability in hundreds of applications around the globe, Cat Pumps provides the best value in the industry.

The reverse osmosis process can be incorporated into a variety of applications:

Water purification, waste water treatment, food processing or pharmaceutical processing.

The significance of reverse osmosis over other methods for separation problems is a low energy requirement. The only energy needed is the pressure to force the fluid through the semi-permeable membrane. This is provided by a high pressure pump driven by electric motor or gas engine.

In water purification, the feed solution is forced across the membrane at pressures generally 1000 PSI or less. As the solution permeates the membrane, the salt and other organics are removed and carried through the system in a solutions called concentrate.

A high pressure Cat Pump forces this feed solution through the membrane causing the separation of the salt ions and the water molecules, resulting in a new solution called permeate.

Particles are not trapped in the membrane, allowing the membrane to be used for long periods without cleaning or replacement.

In this system, the Cat Pump circulates the water twice, leaving extremely pure water (40 PPM) which is ideal potable water aboard yachts and ships. (The World Health Organization and the U.S. Public Health Department recommend 500 PPM total dissolved salts as a standard for drinking water.)

This process has extensive capabilities for both larger and smaller requirements. Either larger or smaller flow Cat Pumps can be substituted and the membrane fibres can be adjusted to accommodate various fluids or allow for varying degrees of filtration.

Reverse osmosisReverse Osmosis applications are extensive and expanding into all facets of industrial, commercial, agricultural and municipal functions because it takes a minimum of space, limited energy and delivers a consistent quantity of quality water.

Other Applications for Reverse Osmosis:

Water Purification

  • Salt separation from various minerals and metalsTypical offshore reverse osmosis applications
  • Organic separations
  • Sediment removal
  • Water re-use
  • Pre-treatment for de-ionizers
  • Bacteria, spores, virus and algae removal
  • Boiler feed
  • Humidifier feed
  • Car wash rinses.

Waster Water Treatment

  • Separation of plating salts
  • Reclamation or rinse waters and complete water re-use
  • Reclamation of valuable metals from plating and photo processing
  • Upgrading waste water to meet Federal and provincial standards
  • Lowering total dissolved solids in waste water
  • Lowering BOD and COD in waste water
  • Removing detergents
  • Removing radio active elements
  • Removing pesticides
  • Removing dye from woolen mill waste water.

Food processing

  • Water removal
  • Selective salt removal
  • Protein enrichment
  • Whey concentration
  • Maple sap concentration
  • Juice concentration
  • Beer and wine concentration
  • Coffee concentration.


Custom Engineered Power Units

You define. We design.

Cat Pumps also offers Custom engineered systems (power units) that are designed to meet your requirements. All units are factory flow and pressure tested before shipment. Complete our Power Unit quote form online or call for a quote.

Design Features:

  • Heavy-Duty construction
  • Compact, streamline design
  • Various control options to meet application needsreverse osmosis power unit
  • Stationary or portable design
  • Electric, gas, diesel and hydraulic drive options
  • Single or multiple pump designs
  • Corrosion-resistant options
  • System Matching accessories.

reverse osmosis image



reverse osmosis power unit








Small Marine Systemssmall marine systems

(0.5 to 20gpm, 1.9 to 75.7lpm)


Our compact, lightweight models are an ideal fit for small pleasure craft and portable units. Compact Direct Drive Models are available to meet small footprint demands and emit low noise levels. Motor-Pump units are also available by request.

“ The rugged durability of Cat Pumps can withstand the corrosive environment in which they are subjected and they have proven to be true workhorses in the desalination field.”

Duwe Dawkins

Founder and President – H2O Softening Systems