PSI Water Filters is the number one Australian supplier for all reverse osmosis systems ranging from laundry style, under sink, counter top and commercial high volume reverse osmosis systems.

  • Using typically QMP American-made housings in our premium range of filter systems and quality Taiwan-made housings in our standard range
  • All housings used are Watermarked and meet Australian standards
  • All under-sink systems come with a mains connection kit, including a pressure limiting valve, storage tank in various sizes, dedicated filtered water tap and instructions
  • We stock all the replacement filters and membranes inc, many after-market and non-standard filters and fittings

Transform your water: Discover the power of reverse osmosis filtration today

If you're looking to buy a top-quality reverse osmosis (RO) water filter in Australia, look no further than PSI Water Filters. We offer a wide range of reliable and efficient RO systems and components, including cartridges, membranes and other parts, to meet your water purification needs.

When it comes to drinking water quality, there's no room for compromise. Get in touch with us today and experience the PSI Water Filters difference.




What is reverse osmosis in the context of water filtration?

Reverse osmosis (RO) is a highly effective water purification process that removes a wide spectrum of contaminants from drinking water. It is a popular and proven method for improving water quality and ensuring safe and clean drinking water.

How does a reverse osmosis water filter work?

A reverse osmosis water filter employs a semi-permeable membrane to divide and flush out contaminants and impurities from water. Here's how it works:

  1. Pressure — The system applies pressure to push water through the RO membrane.
  2. Semi-permeable membrane — The RO membrane has tiny pores that allow water molecules to pass through while blocking larger molecules, ions and contaminants.
  3. Filtration — As water is forced through the membrane, impurities like minerals, salts, heavy metals, bacteria, viruses and chemicals are trapped and flushed away.
  4. Clean water output — The purified water that passes through the membrane is collected in a clean water reservoir, while the contaminants are discharged as wastewater.

What types of contaminants can reverse osmosis remove?

Reverse osmosis water filters are highly effective at removing a wide range of contaminants, including:

  • Sediments and particulate matter
  • Pesticides and herbicides
  • Dissolved salts and minerals (calcium, magnesium, sodium)
  • Bacteria and viruses
  • Chemicals (chlorine, fluoride)
  • Pharmaceuticals and organic compounds
  • Heavy metals (lead, arsenic, cadmium)

Is reverse osmosis water safe to drink?

Yes, RO-filtered water is safe to drink. The RO process effectively removes contaminants, providing clean and safe drinking water. However, it's worth noting that RO systems may remove beneficial minerals from the water, so some people prefer to re-mineralize the water before consumption.

Does reverse osmosis remove minerals from water?

Yes, reverse osmosis can remove minerals from water, including calcium, magnesium and sodium. While this can produce pure water, some argue it may also remove beneficial minerals. If you're concerned about mineral removal, consider adding a mineralisation stage to your RO system or obtaining minerals from other dietary sources.

How often should I replace the reverse osmosis filters and membrane?

The frequency of reverse osmosis filters and membrane replacement depends on factors like water quality, usage and your specific system. Generally, RO membranes may last two to five years, while pre-filters and post-filters may need replacement every six to twelve months. Regular maintenance and water quality monitoring will help determine when replacements are necessary.

Can I install a reverse osmosis system myself?

Many RO systems come with installation kits and instructions, enabling individuals with DIY skills to install the system themselves. However, if you're unsure about the installation process, it's advisable to seek professional help to ensure proper setup. Contact PSI Water Filters today for any enquiries regarding our products and their specific installation processes.

What is the typical maintenance required for an RO system?

Typical maintenance for an RO system includes regular filter and membrane replacement, checking for leaks and sanitising the system periodically to prevent bacterial growth. Following the manufacturer's recommendations for maintenance is crucial to keep the system running efficiently.

Is reverse osmosis water wasteful in terms of water usage?

RO systems can be water-intensive, producing purified water while generating wastewater (brine) containing the removed contaminants. However, some modern RO systems are designed to be more water-efficient, using advanced technology to minimise wastewater production. Choosing an RO system with a higher recovery rate is ideal in reducing water wastage.

Are there any drawbacks to using a reverse osmosis system?

While reverse osmosis is an effective water purification method, it is not without its limitations:

  • Wastewater generation — RO systems produce wastewater during filtration, which can be seen as inefficient in terms of water usage.
  • Mineral removal — RO systems remove minerals from water, potentially leading to a flat taste, and some argue that it may also reduce the health benefits from mineral-rich water.
  • Initial cost — The upfront cost of purchasing and installing an RO system can be relatively high compared to other water filtration methods.

How can I test the quality of water produced by my RO system?

To assess the quality of water produced by your RO system, you can either employ water quality test kits or dispatch water samples to an accredited laboratory for thorough analysis. These tests can help determine the levels of contaminants, minerals and other parameters in your RO water.

Are there different sizes or types of reverse osmosis systems available?

Yes, various sizes and types of reverse osmosis systems are available to suit different needs. Common types include:

  • Under-sink RO systems — Compact systems installed beneath kitchen sinks.
  • Countertop RO systems — Portable units that sit on kitchen countertops.
  • Whole-house RO systems — Larger systems that provide purified water to the entire household.
  • Commercial and industrial RO systems — Designed for larger-scale water purification applications.
  • Portable RO systems — Travel-sized units for use while camping or travelling.

The choice of system depends on your water quality, usage requirements and available space. Selecting the right type and size of RO system to meet your specific needs is essential. Find your ideal RO system at PSI Water Filters today.