PSI-021-4P-GM 4 Stage Reverse Osmosis Under Sink Premium Model
- USA Made Cartridges
- USA Made Housings
- Gauges & TDS Meter
- 5 Yr Warranty
Reverse Osmosis Undersink 4-Stage System with Gauges & Monitoring – Premium Water Filtration
The PSI-021-4GM is a premium 4-stage reverse osmosis system with pro-level visibility and control. It combines dual stainless pressure gauges, a TDS monitor, and an onboard membrane flush valve — so you get pure water and instant feedback on performance.
Advanced Features for Peace of Mind
- Dual pressure gauges — one reads mains pressure; the other reads post-prefilter, pre-membrane pressure. The difference shows prefilter pressure drop, helping you diagnose clogging at a glance.
- TDS monitoring — check dissolved solids before/after the membrane to confirm purity. (Handheld meter included / built-in display depending on kit selection.)
- Onboard membrane flush valve — quickly clear deposits to maintain flow and extend membrane life.
What Sets This System Apart?
- Pressure gauges — stainless, oil-filled, pressure-compensating.
- Housings — U.S.-made QMP, burst rated to 575 psi (4000 kPa).
- NSF-certified tubing — John Guest (UK) NSF/ANSI 61, rated to 230 psi (1600 kPa).
- Auto shut-off valve — Hydromatic (USA) for long-term reliability.
- Check valve — stainless, U.S.-made for robust backflow protection.
- Fittings — genuine John Guest & Jaco Gripper Series only.
- Faucet — Italian/USA/Taiwan NSF lead-free dedicated tap options.
- Membrane — genuine DOW FilmTec (USA) with serial & hologram.
- Filters — U.S.-made; tested to Australian Standard AS3497.
- Inlet ball valve — WaterMark certified to Australian Standards.
4-Stage Filtration
- Stage 1 — 1-micron sediment (U.S.) removes dirt, sand, and suspended particles.
- Stage 2 — Coconut carbon block (Omnipure, U.S.) reduces chlorine & organics (≈37,000 L rating).
- Stage 3 — DOW FilmTec RO membrane removes ~96–98% fluoride, salts, nitrates, heavy metals, etc.
- Stage 4 — Coconut carbon post-filter final polish for taste and VOC reduction.
- Optional — Alkaliser (re-mineraliser) adds minerals and balances pH.
System Specs
- Minimum pressure — 40 psi (280 kPa); optimal ≈ 50 psi (350 kPa).
- Main unit size — 42 cm (H) × 35 cm (W) × 14 cm (D).
- Dedicated drinking tap — stylish, lead-free options available.
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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Optional 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.
Cartridge Replacements
- Annual filter pack (ROCDU-02) — order here.
- RO membrane (~4 years) — order here.
- Re-mineraliser (~2 years, if fitted) — order here.
Warranty
Backed by a 5-year warranty. Built from internationally recognised, premium components and tested for reliability, safety, and performance. Covers defects in materials and workmanship under normal use — see full warranty terms for details.