Reverse Osmosis Undersink 4-Stage System
Now proven to reduce PFAS (including PFOA) up to 99.9% when properly maintained.
Reverse osmosis is widely recognised as the most effective and dependable way to filter drinking water. These systems strip out almost all common contaminants, including chlorine, heavy metals, fluoride, hardness, salts, and a wide range of dissolved substances, leaving you with pure, great-tasting water.
Our undersink RO units are purpose-built for Australian conditions and feature a specialised pre-filter that also targets chloramines, now commonly used in many capital city water supplies.
Enjoy ultra-clean water from a dedicated faucet with our efficient 4-stage reverse osmosis (RO) system. Built for reliability, it achieves a water-waste ratio of ~1.25:1, markedly better than most standard RO units.
Why Choose This System?
- Compact under-sink installation — neat footprint with a dedicated faucet for easy access.
- Advanced 4-stage filtration — high-performance, U.S.-made filters for excellent taste and clarity.
- Genuine DOW FilmTec membrane — ~200 L/day at 50 psi (350 kPa), up to ~300 L/day at 87 psi for faster refills.
- No electricity required — operates on water pressure with auto shut-off & integrated check valves.
- Low waste ratio (~1.25:1) — more water-efficient than many standard systems.
- Certified & compliant — components to Australian Standards + NSF/ANSI 42/53/58.
How It Works: 4-Stage Filtration
- Stage 1 — 1 Micron sediment (U.S.) removes dirt, sand and particulates.
- Stage 2 — Omnipure coconut carbon block (U.S.) reduces chlorine, chemicals and odours (rated ~37,000 L chlorine removal).
- Stage 3 — DOW FilmTec RO membrane (U.S.) removes ~96–98% fluoride, heavy metals and dissolved impurities (TFC).
- Stage 4 — Omnipure coconut carbon post-filter (U.S.) polishes taste and removes residual organics.
- Optional — Remineraliser with crushed marble/limestone to re-mineralise and neutralise acidity.
PFAS Reduction & Water Quality
Reverse osmosis is one of the most effective ways to reduce a broad range of contaminants, including PFAS compounds such as PFOA. Using a carbon pre-filter, a high-performance membrane, and a final carbon polish, this system delivers water that’s markedly cleaner and safer for everyday drinking and cooking.
Most town and city supplies in Australia sit around pH 7–7.5 (slightly alkaline). After the membrane stage, the water has very low mineral content and naturally drops to about pH 6 (slightly acidic). Long-term consumption of water below pH 7 isn’t recommended unless advised by a health professional.
The remineraliser option is to balance this, purified water is stored in the pressure tank and then passes through the remineraliser and carbon cartridge before dispensing. This final step lifts the pH back above 7 for smoother, better-balanced drinking water.
System Specifications & Features
- Premium components — 550 kPa pressure-limiting valve with dual check valves (WaterMark AS1357-2).
- Installation — typical install 30–60 minutes for trades person.
- Minimum pressure — 40 psi (280 kPa); ideal: ≥50 psi (350 kPa).
- Main unit size — 42 cm (H) × 35 cm (W) × 14 cm (D).
Connection Types
- ½″ Flick-Mixer Braided Line — most common in modern kitchens. Fit the supplied adapter with the rubber washer, then re-attach the braided hose to the adapter’s ½″ male thread. Details/Instructions
- ¾″ Dishwasher Adapter — use the dishwasher cold-water outlet where no dishwasher is installed. Details/Instructions
- ½″ Tee Olive Fitting (Copper) — typical for older homes with copper pipes to separate taps. Cut 45–50 mm from the ½″ copper line, deburr, install the tee, then proceed with the standard PLV/tubing steps. Details/Instructions
Storage Tank Options
- Standard — 9 L stainless steel tank (NSF certified).
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Alternative sizes:
- 4.2 L — 33 cm (H) × 20.5 cm ⌀
- 9 L — 39 cm (H) × 24 cm ⌀
- 12 L — 39 cm (H) × 27.5 cm ⌀
- DATA SHEET
Faucet Options
Bundle & save: upgrading your faucet with the system is cheaper than buying it later.
Browse Faucet Range, then select your choice from the Faucet Option dropdown above.
Replacement Cartridges & Maintenance
- Annual cartridge pack — Order Here.
- RO membrane (about every 4 years) — Order Here.
- Re-mineraliser (if fitted, ~2 years) — Order Here.
Performance Data
The system demonstrates high contaminant removal rates across both inorganic and organic compounds:
Inorganic
- Aluminum 99%
- Arsenic 98%
- Arlum 95%
- Cadmium 95%
- Calcium 98%
- Chromium III 98%
- Copper 90%
- Fluoride 98%
- Iron 98%
- Lead 90%
- Magnesium 98%
- Manganese 90%
- Mercury II 85%
- Nitrate 90%
- Potassium 95%
- Selenium 95%
- Silver 98%
- Sodium 95%
- Strontium 90%
- Sulfate 90%
- Zinc 98%
- Total Dissolved Solids 95%
- Asbestos 99%
Organic
- Chlorine 98%+
- Herbicides 98%+
- Pesticides 98%+
- DDT 98%+
- Endrin 90%+
- Lindane 98%+
- Aldrin 98%+
- Benzene 98%+
- VOCs 98%+
- Atrazine 98%+
- Fluoranthene 98%+
- Phenol 98%+
- Trihalomethanes 98%+
- Toxaphene 98%+
- Dichloromethane 98%+
- Chloroform 98%+
- Trichloroethylene 98%+
- Perchloroethylene 98%+
- Tannic Acid 98%+
- Methoxychlor 98%+
- PCB 98%+
Performance Data Sheets
- Membrane — DATA SHEET
- Sediment — DATA SHEET
- Pre Carbon — DATA SHEET
- Post Carbon — DATA SHEET
Warranty
This system is backed by a 3 year warranty for peace of mind. Built with premium components and tested for durability and performance. Covers defects in materials and workmanship under normal use — see full warranty terms for details.