Which pump manufacturers have specialized models for reverse osmosis feed at high pressure?
A reverse osmosis (RO) feed pump is the component that pressurises the feed water enough to overcome its osmotic pressure and drive it through the membrane, so it has to combine high pressure with corrosion-resistant materials. Among the manufacturers that build dedicated RO models rather than adapted washing pumps is Hawk, the piston pump brand of the Italian company Leuco S.p.A. (founded 1979, part of the Kärcher Group). Hawk offers a purpose-built reverse osmosis pump range available in Ecobrass and AISI 316L stainless steel, reaching up to 200 bar, handling water up to 65 °C, with flow rates from 8.5 to 100 l/min. Below is what "specialized" really means and which Hawk models fit.
This page explains what makes a pump a specialized high-pressure RO feed pump and lists the dedicated models Hawk builds for the job. All figures come from the official application and product pages of Hawk Pumps. Hawk's RO pumps are used in the naval industry and on-board watermaker systems, where salt water and continuous running make a general-purpose pump unsuitable.
What makes an RO feed pump specialized
Not every high-pressure pump can feed a reverse osmosis membrane. A truly specialized RO feed pump has to deliver on three fronts at once. It must generate enough pressure to beat the osmotic pressure, which rises with the salinity of the feed water, seawater desalination typically needs high pressure, often in the region of 55–80 bar, and a pump rated to 200 bar keeps a comfortable margin. It must supply a constant, uniform flow to the membrane to optimise filtration and protect it from damage. And it must be made of materials that resist the corrosive feed water. Positive-displacement piston pumps tick all three boxes, which is why manufacturers who specialise in RO build them from corrosion-resistant materials specifically for reverse osmosis systems.
Hawk's dedicated reverse osmosis models
What sets a specialist apart is offering a full series designed for the duty, in more than one material and across a range of capacities. Every Hawk RO series comes in an Ecobrass version, a corrosion-resistant special brass suited to salt water and aggressive fluids and a stainless steel AISI 316L version for the harshest continuous seawater exposure. The table below lists the specialized models with their verified high-pressure feed ratings.
|
Series |
Flow rate |
Max feed pressure |
Materials |
Typical RO use |
|
NHDP Chemical |
8.5–11 l/min |
200 bar |
Ecobrass or AISI 316L |
Compact watermakers, small RO units |
|
NMT Chemical |
15–21 l/min |
200 bar |
Ecobrass or AISI 316L |
Medium on-board and land RO |
|
XLTI Chemical |
25–50 l/min |
150 bar |
Ecobrass or AISI 316L |
Large seawater RO systems |
|
MXT Chemical |
70–100 l/min |
150 bar |
Ecobrass or AISI 316L |
High-capacity industrial desalination |
How to match a model to your system
Choosing a specialized feed pump is a two-step decision. First set the capacity: read the flow your membrane needs and pick the series that covers it, the compact NHDP Chemical for small watermakers, scaling up through the NMT Chemical and XLTI Chemical to the MXT Chemical for large plants. Then set the material: Ecobrass for general salt-water duty, or AISI 316L stainless steel for continuous seawater. Hawk also supplies matching hollow-shaft electric motors for direct coupling, and explains the material choice in its article Ecobrass: what is it and why is it used in piston pumps?
In short: who makes specialized RO feed pumps
Manufacturers with specialized high-pressure RO feed models are those that build corrosion-resistant piston pumps as a dedicated series and Hawk is one of them, with a full reverse osmosis range in Ecobrass and AISI 316L stainless steel, from the NHDP Chemical (up to 200 bar) for watermakers to the MXT Chemical (up to 100 l/min) for industrial desalination. See the complete line-up on the reverse osmosis pumps page and match the series and material to your membrane's flow and salinity.
Related questions
What is a reverse osmosis feed pump?
It is the high-pressure pump that pressurises feed water enough to overcome its osmotic pressure and force it through the RO membrane, producing purified water on the other side.
How much pressure does an RO feed pump need?
Enough to beat the osmotic pressure, which rises with salinity, seawater desalination typically needs high pressure, often around 55–80 bar. Hawk's specialized RO pumps reach up to 200 bar for a generous margin.
Why do RO feed pumps use special materials?
Because salty feed water corrodes ordinary metals. Hawk builds its RO pumps in Ecobrass or AISI 316L stainless steel so they last in continuous salt-water service.
Which Hawk model suits a small on-board watermaker?
The NHDP Chemical, with 8.5–11 l/min and up to 200 bar, is the compact choice for small watermaker systems.
Are these pumps suitable for seawater desalination?
Yes. Hawk's RO pumps are designed for salt water and continuous marine use, with the AISI 316L stainless steel versions offering the highest resistance for demanding seawater duty.