Reverse Osmosis Undersink 4-Stage System – Premium Water Filtration

Enjoy ultra-pure water directly from your dedicated faucet with the premium PSI-021-4P Reverse Osmosis System. Designed for efficiency, reliability, and low water wastage, this system features the Dow Filmtec 300 L/day membrane, offering superior performance with a 1:1 waste ratio.

Why Choose This System?

The PSI-021-4P Reverse Osmosis System is engineered for superior performance and reliability, outperforming many standard systems. With the Dow Filmtec membrane, this unit delivers fast refills and offers the industry-leading TFC membrane for optimal filtration.

• Compact Under-Sink Installation – Fits neatly under your sink with a dedicated faucet for easy access.
• Advanced 4-Stage Filtration – Utilises high-performance filters to remove impurities effectively.
• Genuine Dow Filmtec Membrane – 300L/day production rate at 50 psi (350 kPa) for faster refills.
• Low Waste Ratio (1:1) – More water-efficient than many other systems, using advanced membrane flushing technology.
• Auto Shut-Off Function – Automatically stops water flow when the storage tank is full.
• NSF Certified & Compliant – Meets Australian Standards and NSF certifications for safety and performance.
• Optional Alkalizer (Re-Mineraliser) – Adds essential minerals and neutralizes the pH of water, improving taste.

How It Works: 4-Stage Filtration Process

• Stage 1: 1-Micron Food-Grade Sediment Filter – Removes dirt, sand, and other particles (U.S. made).
• Stage 2: Omnipure Coconut Carbon Block Filter – Reduces chlorine, chemicals, and odors (Rated for 37,000 litres of chlorine removal).
• Stage 3: Dow Filmtec Reverse Osmosis Membrane – Removes 96-98% of fluoride, heavy metals, and other contaminants (U.S. made).
• Stage 4: Omnipure Coconut Carbon Post-Filter – Further purifies water, enhancing taste and removing organic compounds (U.S. made).
• Optional Alkalizer (Re-Mineraliser) – Restores essential minerals and balances water pH.

System Specifications & Features

• Premium Components – Includes the QMP-300-HP housing with a burst strength of 575 psi (4000 kPa), NSF-certified for safety.
• Installation Options – Choose from ½” tee olive fitting, ¾” dishwasher adapter, or ½” easy-fit braided line flick mixer adapter.
• Easy Installation – Designed for DIY installation, takes approximately 30-60 minutes.
• Minimum Pressure – Requires a minimum of 40 psi (280 kPa), with 50 psi (350 kPa) being ideal.
• Main Filter Unit Size – 42 cm high × 35 cm wide × 14 cm deep.

Storage Tank Options:

• Standard: 9L stainless steel tank (NSF certified, exceeds drinking water guidelines).
• Alternative Tank 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 (Replaced every 4 years) – Click here to order.
• Re-Mineraliser Cartridge (If fitted, replaced every 2 years) – Click here to order.

Warranty

This system comes with a 5-year warranty, ensuring peace of mind and reliable performance. Our premium systems are built to last, with top-quality components that are tested for durability and performance. The warranty covers all defects in materials and workmanship under normal use. Please refer to the full warranty terms for more details.