PSI-021-5RM 5 Stage Re-Mineralizing, Oxygen rich alkalising
- USA made Filters
- USA made Housings
- pH Neutral
- 5 Yr Warranty
Reverse Osmosis 5-Stage System – Alkalising, Re-Mineralising, Oxygen-Rich
The PSI-021-5RM delivers pure RO water, restores beneficial minerals, oxygen-enriches the final stage, and balances pH — for great-tasting, health-conscious hydration from a sleek dedicated faucet. Built around a genuine DOW FilmTec membrane with a low ~1:1 waste ratio.
Why Choose This System?
This 5-stage RO pairs high rejection performance with re-mineralising, alkalising and oxygen-enrichment stages to elevate both quality and taste.
- Advanced 5-stage filtration — includes dedicated alkaliser/ re-mineraliser.
- Premium DOW FilmTec membrane — ~300 L/day @ 50 psi with ~1:1 low waste ratio.
- Alkalises & adds minerals — boosts pH and flavour with calcium & magnesium.
- Oxygen-rich output — fresh mouthfeel from the final stage.
- Compact undersink design — dedicated lead-free faucet included.
- NSF-certified components — meets Australian & international standards.
- Auto shut-off valve — prevents tank overfill and conserves water.
How It Works: 5-Stage Filtration
- Stage 1 — 1-micron sediment (U.S.) removes rust, sand & particulates.
- Stage 2 — Omnipure carbon block (U.S.) reduces chlorine, chemicals & odours (≈37,000 L).
- Stage 3 — DOW FilmTec RO membrane removes ~96–98% fluoride, heavy metals, nitrates & dissolved salts.
- Stage 4 — Omnipure coconut carbon post-filter polishes taste and reduces residual VOCs.
- Stage 5 — Re-mineraliser & alkaliser adds calcium/magnesium, oxygen-enriches, balances pH.
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; the re-mineraliser lifts pH back above 7 for balanced taste.
System Specifications & Features
- Housings — QMP-300-HP, NSF-certified; burst rating 575 psi (≈4000 kPa).
- Operating pressure — minimum 40 psi (280 kPa); optimum ~50 psi (350 kPa).
- Main unit size — ~42 cm (H) × 35 cm (W) × 14 cm (D).
- 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
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 ⌀
- TANK 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. Fits most sink/benchtop holes (12–13 mm) and standard thicknesses.
Replacement Cartridges & Maintenance
- Annual cartridge pack (ROCDU-02) — order here.
- RO membrane (~4 years) — order here.
- Re-mineraliser / alkaliser (~2 years) — cartridge or calcite refill.
- Membrane care: flush the membrane for ~15 minutes every 2–3 months; replace about every 4 years for best performance.
Performance Data
The system demonstrates high contaminant removal rates 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
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Remineraliser — DATA SHEET
Additional Information
Cartridge replacement tutorial
Warranty
This PSI 5-stage reverse osmosis system includes a 5-year warranty covering defects in materials and workmanship under normal household use. Built with high-grade components from trusted brands — see full warranty terms for details.
Customer Reviews
Customer Reviews
Love this filter system. Easy to install and beautiful drinking water
After doing a lot of research, I decided on PSI to purchase a RO under sink system. So happy I did. The service both over the phone, and through the website chat function was fantastic. Delivery was quick and easy. The pricing is very competitive and I like that I'm supporting Aussie business! This way, I can have confidence that I'll be able to get correct replacement cartridges when I need them.
Callum responded to my enquiries within an hour on a weekend, and the unit was dispatched promptly as well. The plumber found it easy to install and the quality of the water is great. Despite the remineralisation stage my measured water hardness is only 15 ppm. Excellent value compared to other options on the market.
Brilliant service to provide quality parts for great clean water. We had a new system installed day 1 in our new house after using a PSI reverse osmosis 5 stage filtration in our previous house for years. Cannot recommend it enough.
My son and his wife have just had a baby so purchased one of these to make sure the water they use is the best possible, we have owned ours for years they are brilliant.
