Reverse Osmosis Systems for Hospitals

Is your hospital reverse osmosis system AS/NZS4187 compliant?

CSSD (Central Sterile Supply Department) Sterilisation units are used to supply healthcare facilities with water with reduced hardness and bacterial load to be used in sterilisers . Following the introduction of AS/NZS4187:2014, the recommended water treatment method for healthcare facilities to produce sterile water is Reverse Osmosis. Given that healthcare facilities potentially contain a large range of  pathogens and that treated water cannot contain residual disinfectant, extreme care must be taken with the post membrane distribution system to prevent recontamination.

Moerk Water systems are designed, fabricated, and tested in Perth, Western Australia to the highest standard, using instruments and materials which specifically target AS/NZS4187:2014 compliance (specifically Table 7.2 – final rinse water and Table 7.4 – steam sterilisers). Moerk Water’s advanced CSSD RO design has eliminated the need for multiple system components (such as softener, deionisation, UV, secondary RO) while still complying with AS/NZS4187:2014. This simplification not only reduces the risk of bacterial growth in additional treatment trains but also reduces the overall complexity while keeping capital, operating and servicing costs low.


  • Excellent build quality
  • Simplified, cost effective design that still complies with AS/NZS4187:2014
  • Locally designed and built
  • Thorough in-house testing to ensure compliance
  • Wide range of capacities available

Get in touch with one of our water specialists today.

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The pretreatment system of a CSSD RO system includes fine filtration and dechlorination (if chlorinated water is used as feedwater). The filtered feedwater then undergoes two passes of Reverse Osmosis whereby the purified water produced from the first Reverse Osmosis module is passed into a second Reverse Osmosis module to purify it further. Due to this the overall recovery rate of the system is relatively low but the quality is very high. The ultrapure water that is produced by the second Reverse Osmosis unit is then sent to a food grade stainless steel tank to be heated prior to distribution.


CSSD RO is the ideal solution for treating healthcare facilities looking for a reliable source of sterilised water. The treated water that is produced is of high quality and all sources of possible contamination within the treatment system can be controlled. Although tap water is the most common feedwater for CSSD RO, the system can be adapted to treat a wide range of low salinity feedwater sources.


Our treatment plants are individually designed to meet the specific requirements to create a supply of water that is safe for drinking or use in commercial and industrial situations.

Healthcare (incl. CSSD RO)

In order to reduce the risk to their patients and ensure that their sterilisation programs are effective, hospitals now need to comply with AS/NZ 4187. Moerk Water’s significant experience and expertise in the design and construction of CSSD RO and water treatment systems for health clinics around the world mean that our clients can be confident they will be getting a reliable and compliant water supply.


Moerk Water’s CSSD RO is predominantly used to treat chlorinated tap water to a level that complies with AS/NZS4187:2014. Please talk to a Moerk Water specialist if you would like to treat an alternative source.

Fresh Water

Just because water is fresh, does not mean it is fit for purpose. Moerk’s specialist team can provide water consultancy services, then use the results to advise on the best treatment solution to ensure your fresh water supply is free of contaminants, including bacteria, parasites and viruses, as well as particles. The result is water that is not only safe for human consumption but for use in your specific situation.


Clarification Filtration

Clarification Filtration is a chemical/physical method to reduce the dirt load in the water. Fine particles below a certain size will pass through standard filters. Following clarification filtration, depending on the water quality required, the water can be further purified to reduce the salt load or remove any other contaminants of concern.

Iron Removal Systems

Moerk Water’s Iron Removal Systems remove iron from any water source, eliminating concerns about iron bacteria contamination, corrosion, and scaling. Our iron removal systems utilise aeration mechanisms and filters with an automated backwash to reliably removing iron from the water while keeping the systems hands-free and operating costs as low as possible.


Typically when we think of reverse osmosis we imagine large facilities that underpin a city’s water supply or small under sink units. However, in our context, we have adapted these membrane systems to be both transportable and optimised for whatever scale various agricultural and commercial concerns require.

Brackish Water Treatment

Moerk Water specialises in designing and building custom desalination plants and systems to treat various saline water sources to achieve water that is ready for commercial application and/or safe drinking water.

Seawater Desalination

Reverse osmosis is the most cost effective method for removing the salt from seawater (seawater desalination). Given the high energy cost of the process, energy recovery devices, low recovery rates and renewable energy systems are all factors effecting the utility of this system