HRO 4 Reverse Osmosis System

Treat municipal or brackish water supply and remove dissolved solids

The Hellenbrand HRO 4 is a state-of-the-art, versatile systems for treating municipal and brackish water supplies and with flow rates ranging from 500 to 8,000 gallons per day. Minimal energy consumption, low maintenance and operation costs make the HRO 4 Reverse Osmosis System the right choice.

Hellenbrand Reverse Osmosis System HRO4 P

Download for more information.

Water Talk Icon

Innovative Versatility

Innovative design allows for versatility to suit the needs of your business

Plumbing Icon

Stainless Steel

Featuring robust components made of stainless steel

Water on Demand

Energy Efficient

Manufactured for minimal energy consumption

Checklist Icon

Decreased Size

Smaller footprint is big on features, but not on space

Blue wrench icon

Fully Assembled

Components are easily accessible, pre–plumbed, wired and assembled



1 Year Limited Warranty through Axeon

Features of the HRO 4 Reverse Osmosis System 

  • C21 or C23 Switch Controller with Feed Flush
  • Extra Low Energy Membrane Elements
  • Fiberglass Membrane Housings
  • 4.5” x 20” Single O-Ring Pre-Filter Housing
  • 5 Micron Sediment Pre-Filter
  • Concentrate Flow and Recycle Flow Meter
  • Permeate Flow Meter
  • Pre-Filter In and Out Pressure Gauge
  • Pump Operating Pressure Gauge
  • Motor Thermal Overload Protection
  • Multistage Stainless Steel Centrifugal Pump
  • ASCO Solenoid Valve
  • Stainless Steel Concentrate and Recycle Valve

The HRO 4 is big on features, but not on space


Big on features but not on space, the HRO4 Reverse Osmosis System features a robust, innovative design that allows for versatility in the event of feed water quality and temperature variations. A C21 or C23 controller with feed flush comes standard to reliably operate the system. HF4-Series Extra Low Energy membranes are standard on all systems and offer high rejection and flow rates for quality system performance. The HRO4 also features a heavy duty 1/2 HP or 1 HP stainless steel multistage booster pump for superior performance and corrosion resistance.

Frequently Asked Questions

Wonder What’s in your Water?

Find out exactly what’s in your water. Request a free

water analysis today.

Wonder Form Business

  • This field is for validation purposes and should be left unchanged.

Hellenbrand Water Center Customer Service employee wearing jeans and a light blue shirt.Hard water is high in minerals like calcium, magnesium and carbonate. It can occur with both city and well water, and takes a huge toll on your home, clogging up your appliances, creating spotty dishes and leaving your skin dry and your clothes dull and scratchy.

But with a Hellenbrand single- or twin-tank home water softening system you can reduce the effect these minerals have on you, and your home. Softeners remove unwanted contaminants before your water even travels through your pipes, into your water-using appliances or before you switch on the taps of your bathrooms and kitchen—giving you softened, mineral-free water to every room in your home.

Hellenbrand Water Center Customer Service employee wearing jeans and a light blue shirt.Softening water involves a process called “ion exchange,” which removes dissolved minerals like as calcium, magnesium, iron and manganese—particles that can’t be trapped in a filter bed. To remove these particles, softening systems contain hundreds of resin beads charged with sodium. As water enters the tank, dissolved calcium and magnesium are attracted to the resin, forcing the resin to exchange its sodium for the dissolved chemicals and freeing the water of impurities.

Filtering water removes impurities using either physical barriers, chemical processes or biological processes. Each method cleanses water to a varying degree to suit specific water uses like drinking water, irrigation, aquariums, ponds and swimming pools.

Hellenbrand Water Center Customer Service employee wearing jeans and a light blue shirt.Whether you have a city or well water source, iron is a contaminant that often makes it into your home, if left unfiltered, iron can cause your water to have a metallic taste and create hard-to-remove rust stains on household fixtures and appliances.

Hellenbrand has several filtration technologies that help reduce or remove iron from your home. Like the patented twin-tank Iron Curtain 2.0™ that uses oxygen to filter out iron, manganese and sulfur particles. Or the Hellenbrand ProMate 6 Storm, which uses ozone to precipitate out iron, manganese and sulfur to reduce nuisance bacteria.

Hellenbrand Water Center Customer Service employee wearing jeans and a light blue shirt.Most municipalities don’t soften water in a central location before providing it to your home. This unsoftened water can cause a buildup of minerals, also called “scale,” and can harm the efficiency and shorten the lifetime of your water-using appliances and fixtures. Even if your municipality is using surface water, reservoirs or lake water you may need a softener to help reduce the buildup of minerals in your home. Your local water pro will be able to test and verify if you’ll need a softener to reduce or remove minerals from your water supply.