Reverse Osmosis - Desalination - Filtration

Reverse Osmosis Filtration (R.O.) 98% of Salt & Mineral Removal

At Coolabah Water we have a number of Reverse Osmosis that we supply we have sourced the best system out of the market place and with our expertise can show you as a customer how to get the best value systems keep them running at their peak delivering pure water to you all the time when you need it.

Feed water will pass from a softening unit through a cluster filter housing capturing any sediment particles before entering a final filter system. This filtration protects the stainless steel pressure pump and lead ends of the membranes from unwanted fouling. Typically these filters would need to be changed periodically or whenever there is a sufficient pressure differential across the filters. An antiscalant used to prevent salts crystallizing on the membranes giving membranes a far greater life span. The units incorporate shutdown flush cycles that help protect the membranes and help ensure a trouble free operation. On shut down the highly salty brine water around the membranes is flushed away using bore water to provide protection of the membranes while sitting idle.

Elementary Reverse Osmosis Process

Flow chart describing the reverse osmosis process

The units will produce fresh water which would be fed to a fresh water tank and reject brine for disposal. Sensors monitor levels to allow the unit to start up and shut down automatically. Units generally operate under automatic control and only require the start button to be pushed to start and stop the machine. Units run unattended and require no operator input during normal operation apart from periodic topping up of the antiscalant and periodic maintenance. Antiscalant is used as a further measure to prevent fouling of the membrane surface with scale that can be formed from concentrating bore water.

The power source is single phase and a basic layout drawing as an installation guide will be supplied with each unit. Units come with a Manual describing the process and how to best maintain the unit. The units are able to be expanded up to a point, should the end user find the need. The Membranes are often rated to last for 3 years but can last longer.

Membrane Elements

How a Membrane Element Works The spiral-wound membrane element is constructed of one or more membrane envelopes wound around a perforated central tube. The permeate water passes through the membrane into the envelope and spirals inward to the central tube.

Diagram of the components of a reverse osmosis filter

Reverse Osmosis generally works in this way water would be pump from the source, often this will be a bore then to a softening system and pre filtration then to Reverse Osmosis filtration and storage.

This diagram tells us what types of filters remove different contaminants from water.

(Click to enlarge and view the full PDF)
Diagram showing the relative size of common materials found in water and the types of filters that will remove them


Pictured Below are Industrial Reverse Osmosis Systems that can be supplied.Industrial Reverse Osmosis SystemIndustrial Reverse Osmosis SystemIndustrial Reverse Osmosis System

These are laboratory quality Reverse Osmosis units cabable of supplying up to 2000 Litres of pure water per hour.

They are generally custom designed using imported components assembled in Australia.

Water data required for reverse osmosis design

This is information that we need in order to assess your needs in R.O. treatment of water. If you don't have recent water test results, we can test your water for a very small cost.

Please call our office - 1800 069 800 - for water testing information.

Treated Water Quality Requirement

Product water flow
Litres/hour or M3/Day
Total Dissolved Solids
ppm;or Conductivity mS/CM
Application Involved:
(what do you want to do with the water)

Feed water characteristics:

Water Temperature
Min. Deg C - Max. Deg C
Quantity feed water available
Litres/hour at a pressure of kPa

Feed water analysis:

The following analysis will be used to predict precipitation in the Reverse Osmosis concentrate stream and to optimise a design that avoids fouling and scale deposition causing premature membrane failure. A complete and accurate analysis is essential.

Conductivity - mS/CM Total Dissolved Solids mg/L
Turbidity NTU Total Suspended Solids mg/L
pH range Total Organic Carbon mg/L
Chlorine Bromine  
Cations in mg/L Anions in mg/L  
Aluminium Carbonate  
Ammonium Bicarbonate  
Barium Bromide  
Calcium Chloride  
Iron Fluoride  
Magnesium Nitrate  
Manganese Phosphate  
Potassium Silica  
Sodium Sulphate  


List all chemical additives added to the feed water such as:

Polymeric coagulants; cationic polymers; acrylic or methacrylic acid; alum, PAC, ferric salts, polyelectrolytic polymer; aromatic hydrocarbons; aliphatic hydrocarbons; ketones, esters, quaternary ammonium compounds such as benzylkonium chloride; silicon antifoams.

Contact Us

  • Postal Address:
  • PO Box 1160
  • Wagga Wagga NSW 2650 Australia
  • Location:
  • 111 Biroomba lane
  • Wagga Wagga NSW 2650 Australia
  • Phone: 02 6925 8555