PSI-021-4P 4 Stage Reverse Osmosis Under Sink Premium Model
- USA Made Filters
- USA Made Housings
- Optional Remineraliser
- 5 Yr Warranty
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.
- Compact under-sink installation — fits neatly with a dedicated faucet for easy access.
- Advanced 4-stage filtration — removes impurities effectively for excellent taste.
- Genuine DOW FilmTec membrane — 300 L/day at 50 psi (350 kPa) for faster refills.
- Low waste ratio (1:1) — advanced flushing technology makes it more water-efficient.
- Auto shut-off function — automatically stops water flow when the storage tank is full.
- Certified & compliant — NSF/ANSI certified, meets Australian Standards.
- Optional alkaliser — restores minerals and balances pH for smoother taste.
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).
- Stage 3 — DOW FilmTec RO membrane (U.S.) removes 96–98% fluoride, heavy metals and dissolved impurities.
- Stage 4 — Omnipure coconut carbon post-filter (U.S.) polishes taste and removes organics.
- Optional — Alkaliser with crushed marble/limestone to re-mineralise and neutralise acidity.
System Specifications & Features
- Premium components — QMP-300-HP housings, burst strength 575 psi (4000 kPa), NSF certified.
- DIY-friendly — typical install 30–60 minutes for a confident handyman.
- 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.
- ¾″ Dishwasher Adapter — use the dishwasher cold-water outlet where no dishwasher is installed.
- ½″ Tee Olive Fitting (Copper) — typical for older homes with copper pipes to separate taps.
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 ⌀
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 (~2 years) — order here.
Warranty
This system is backed by a 5-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.
