Reverse Osmosis 5-Stage System – Alkalising, Re-Mineralising, Oxygen-Rich

The PSI-021-5RM is the ultimate in water purification. Not only does it provide pure reverse osmosis filtered water, but it also restores beneficial minerals, oxygenates the water, and balances pH – delivering great-tasting, health-conscious hydration direct to your sink.

Why Choose This System?

This 5-stage reverse osmosis system offers exceptional filtration performance, combined with the benefits of re-mineralisation, alkalisation, and oxygen enrichment. The Dow Filmtec membrane ensures high flow and low waste, while the final stages enhance both water quality and taste.

• Advanced 5-Stage Filtration – Includes dedicated alkaliser and re-mineralising cartridge.
• Premium Dow Filmtec RO Membrane – 300L/day at 50 psi with a 1:1 low waste ratio.
• Alkalises and Adds Essential Minerals – Enhances pH, flavour, and nutritional value of the water.
• Oxygen-Rich Output – Final stage oxygenates water for improved mouthfeel and freshness.
• Compact Undersink Design – Easily fits beneath your sink with a sleek dedicated faucet.
• NSF Certified Components – Meets Australian and international water safety standards.
• Auto Shut-Off Valve – Prevents overfilling of storage tank, conserving water.

How It Works: 5-Stage Filtration Process

• Stage 1: 1-Micron Sediment Filter – Removes sediment, rust, and particles (U.S. made).
• Stage 2: Omnipure Carbon Block Filter – Removes chlorine, chemicals, and odours (Rated for 37,000L).
• Stage 3: Dow Filmtec RO Membrane – Removes 96–98% of fluoride, heavy metals, nitrates, and more.
• Stage 4: Omnipure Coconut Carbon Post-Filter – Polishes water, enhancing taste and odour.
• Stage 5: Re-Mineraliser & Alkaliser Cartridge – Adds calcium, magnesium, oxygen, and balances pH.

System Specifications & Features

• Housing – QMP-300-HP NSF-certified with a 575 psi (4000 kPa) burst rating.
• Operating Pressure – Minimum 40 psi (280 kPa), optimum at 50 psi (350 kPa).
• Compact Size – Main unit measures approximately 42 cm high × 35 cm wide × 14 cm deep.
• Installation Options – Includes choice of:
  • ½” tee olive fitting
  • ¾” dishwasher adapter
  • ½” braided line flick mixer adapter
• DIY-Friendly Installation – Install in around 30–60 minutes with standard tools.

Storage Tank Options:

• Standard: 9L stainless steel tank (NSF certified).
• Alternative Sizes:
  • 4.2L: 33 cm high × 20.5 cm diameter
  • 9L: 39 cm high × 24 cm diameter
  • 12L: 39 cm high × 27.5 cm diameter

Replacement Cartridges & Maintenance

• Annual Cartridge Pack (ROCDU-02) – Click here to order.
• Reverse Osmosis Membrane (Every 4 years) – Click here to order.
• Re-Mineraliser / Alkaliser Cartridge (Every 2 years) – Click here to order Cartridge or click here to order refill
  

Additional Information

Cartridge replacement tutorial

Warranty

This PSI 5-stage reverse osmosis system includes a 5-year warranty covering all defects in materials and workmanship under normal household use. Our systems are built to last, using high-grade components from trusted brands. Refer to the warranty document for full terms and conditions.