HRO 3.5 Reverse Osmosis System

Space saving design for light commercial applications

HRO 3.5-Series Reverse Osmosis Systems have been engineered for capacities of 200 and 300 gallons per day and feature a single pump design for enhanced performance.

Hellenbrand Reverse Osmosis System HRO35 P

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Fully Assembled

Pre-assembled and ready for immediate on-line service

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Compact Design

Compact wall mount space-saving design

Water on Demand

Single Pump

Single pump design for enhanced performance


Daily Capacities

Engineered capacities of 200 to 300 gallons per day

Features of the HRO 3.5 Reverse Osmosis System 

  • 5 Micron Sediment Pre-Filter
  • 10 Micron Carbon Block Pre-Filter and Post-Filter
  • Pentek® 10” Filter Housings
  • HF4 Extra Low Energy Membrane
  • Fiberglass Membrane Housing
  • 0 – 300 psi Glycerin-Filled Pump Pressure Gauge
  • 0 – 100 psi Glycerin-Filled Pre-Filter Pressure Gauge
  • 0 – 100 psi Glycerin-Filled Permeate Pressure Gauge
  • John Guest® Push/Pull Fittings with Locking Safety Clips
  • Aquatec® High Flow Booster Pump and Tank Pressure Switch A
  • Aquatec® Feed Solenoid and Auto Flush Timer Valve

The HRO 3.5 is ideal for light applications


HRO 3.5 Series Reverse Osmosis System is manufactured for light commercial applications and feature a compact wall mount space-saving design. The HRO 3.5 RO System comes pre-assembled and ready for immediate on-line service with minimal set up and simple utility connections.

Frequently Asked Questions

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Hellenbrand Water Center Customer Service employee wearing jeans and a light blue shirt.Water is continuously on the move, traveling through soil, city filtration facilities and finally making its way through miles of pipelines into your home.

Hellenbrand Water Center Customer Service employee wearing jeans and a light blue shirt.The largest water issue in south-central Wisconsin is hard water. Which is where having a Hellenbrand water softener will help the water quality in your home.

The aquifer supplying our drinking water in south-central Wisconsin requires little treatment. Madison Water Utility disinfects it with chlorine to reduce the risk of microbial contamination. Small amounts of chlorine kill bacteria and viruses potentially present in groundwater. Chlorine also travels with water, ready to kill microbes that it might encounter. The goal is to maintain a chlorine residual above 0.1 milligrams per liter (mg/L) at all points in the distribution system. Typical concentrations range from 0.2 to 0.4 mg/L.

Hellenbrand Water Center Customer Service employee wearing jeans and a light blue shirt.Madison’s tap water is considered to be “very hard,” because of the minerals such as calcium and magnesium in the rock formations from which we draw water. This water contains 18–20 grains of hardness per gallon. There are no harmful health effects associated with these minerals (in fact, some believe they are beneficial), but measuring them does provide a guideline as to how water use may be affected. For example, hard water does result in more scale buildup and you need to use more soap and detergents.

Hellenbrand Water Center Customer Service employee wearing jeans and a light blue shirt.We can get you all the information you need, as well as perform a free water analysis on your home’s water. Or you can visit for more information about water issues specific to your area.