QRO4 Quick-Change 4-Stage Reverse Osmosis System
Quick-change RO with a fast 75 GPD (≈300 LPD) membrane, a self-seal valve head for sub-2-minute filter swaps, and premium fittings throughout. Ships complete with a 550 kPa PLV (with isolation valve), your choice of designer faucets, and mains connection kit. Low ~1:1 waste ratio.
Also Known As
This model is also sold as HydrROtwist or PuRO Twist in some markets.
Why Choose This System?
- Faster output — stocks the 75 GPD (300 LPD) membrane, not slower variants.
- Self-seal valve head — undo the first cartridge (Q5605) and the mains auto-shuts off. No separate shutoff needed.
- 2-minute cartridge changes — genuinely easy DIY servicing.
- Premium hardware — genuine John Guest Speedfit push-in fittings.
- Complete kit — tubing, hardware, and even thread-sealing tape.
- Multiple designer faucets — choose your finish and style.
- Certified — meets NSF standards 42, 53, 58, 61.
- Low waste ratio (~1:1) — about 50% less waste than many brands.
How It Works: 4-Stage Filtration
- Stage 1 — Q5605 5-micron sediment removes dirt, rust & particulates.
- Stage 2 — Q5640 GAC carbon reduces chlorine, chemicals & odours.
- Stage 3 — Q-Series 75 GPD TFC membrane (≈300 LPD, 0.0005 µm) targets dissolved salts (incl. fluoride) & heavy metals.
- Stage 4 — Q5640 carbon post-filter high-grade polishing for taste.
PFAS Reduction & Water Quality
Carbon → membrane → carbon is a proven sequence for broad contaminant reduction, including PFAS (e.g., PFOA). Typical Australian town water is ~pH 7–7.5. After the membrane, minerals are very low and pH can drop to ~pH 6; adding a re-mineraliser (optional add-on) lifts pH back above 7 for balanced taste.
System Specifications & Features
- Dimensions — 42 cm (H) × 42 cm (W) × 10 cm (D).
- Pressure — minimum 40 psi (280 kPa); ideal ≥ 50 psi (350 kPa).
- PLV & isolation valve — 550 kPa pressure-limiting valve included.
- Fittings — genuine John Guest Speedfit push-in.
- Ready to install — product ships complete.
- Waste ratio — ~1:1 (conditions & water temp dependent).
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. 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 separate taps and copper lines. Details/Instructions
What’s in the Box
- 550 kPa pressure-limiting valve with isolation valve
- Mains connection kit of your choice (½″ tee olive, ¾″ dishwasher adapter, or ½″ easy-fit braided-line mixer adapter)
- Your choice of designer faucets (multiple finishes)
- Genuine John Guest Speedfit push-in fittings
- All tubing & mounting hardware
- Thread-sealing tape
Storage Tank Options
- Available sizes — 4.2 L, 9 L, or 12 L stainless steel (all NSF certified).
- TANK DATA SHEET
- See tank details
Main unit and tank can lie on their side/back to suit tight installs and will operate in that position.
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
Performance Data
The system demonstrates high contaminant reduction across both inorganic and organic compounds:
Inorganic
- Aluminum 99%
- Arsenic 98%
- Alum 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 (Omnipure) — DATA SHEET
- Post Carbon (Omnipure) — DATA SHEET
Helpful Resources
- Waste ratios explained — learn more
- Mains connection install guide — how each adapter is installed
- Warranty (5 years) — see terms
- Selection advice — which system suits me?
- Membrane treatment rates (PDF) — download
Warranty
5-year warranty covering defects in materials and workmanship under normal use. Built with high-grade components for long-term reliability — see our warranty page for full terms.