6-Stage Reverse Osmosis Under-Sink Water Filter + UV - Fluoride & Nitrate Removal NZ

Cleaner drinking water at your kitchen tap — without filtering the whole house.

This 6-stage reverse osmosis system with optional UV sterilisation gives you filtered, purified drinking water at a single dedicated tap under your sink. The RO membrane removes fluoride, nitrates, heavy metals, bacteria, viruses, and more — making it particularly well suited to homes where fluoride or nitrate levels are a concern.

Designed for mains water. If you're on a different supply, get in touch and we'll help you work out if it's suitable.

Choose Without UV for core RO filtration, or With UV to add an extra layer of protection against micro-organisms.

Note: this system is for under-sink installation at a single tap. It is not a whole-house system.

Key specs at a glance

• Filter stages: 6 (including RO membrane and mineral cartridge)
• UV option: 6W UV steriliser (optional)
• Expansion tank: 12L (included)
• Dedicated tap: included
• Connection: 15mm female / 15mm male
• Mounting: freestanding or wall-mounted
• Filter housing dimensions: 390(L) x 215(W) x 590(H)mm
• Expansion tank dimensions: 240(L) x 215(W) x 360(H)mm
• Booster pump: 230V / 50Hz, 72 PSI, 130ml/min

Why homeowners choose this system

• The RO membrane removes fluoride, nitrates, heavy metals, bacteria, viruses, and organic substances — going further than sediment and carbon filtration alone
• Point-of-use treatment — clean drinking water at the kitchen tap without paying to filter water that goes to the toilet, garden, or shower
• Mineral cartridge in Stage 6 replenishes essential minerals after RO treatment
• Post-carbon polishing in Stage 5 improves taste before water reaches the tap
• 12L expansion tank stores filtered water so it's ready when you need it
• Dedicated sink tap included — no need to source a separate faucet

How it works

Stage 1 — Sediment (5µm Polypropylene Spun)

Removes sand, silt, dirt, and dust. Protects the downstream stages — especially the RO membrane — from particulate damage.

Stage 2 — Granular Activated Carbon (1µm GAC)

High-adsorption coconut shell carbon removes chlorine, organic chemicals, suspended particles, tastes, and odours. Prepares water for the RO membrane.

Stage 3 — Carbon Block (5µm CTO)

A second carbon stage for thorough chlorine, taste, and odour reduction before the RO membrane.

Stage 4 — Reverse Osmosis Membrane

The core of the system. The RO membrane removes fluoride, nitrates, bacteria, viruses, calcium (limescale), heavy metals including iron, and organic substances. This is the stage that makes RO the preferred choice for fluoride and nitrate reduction.

Stage 5 — Post-Carbon Polish (T33)

A final carbon polishing stage that removes residual taste and odour before water reaches the tap.

Stage 6 — Mineral Cartridge

Replenishes essential minerals removed during the RO process, improving taste and restoring mineral balance.

UV Sterilisation — 6W (With UV variant only)

An additional UV stage that treats water against harmful micro-organisms after filtration. Available as an optional upgrade — select With UV in the dropdown above.

Technical specifications

Specification	Detail
Filter Stages	6
UV Lamp Power	6W (With UV variant)
Water Inlet Connection	15mm Female / 15mm Male
Mounting	Freestanding or wall-mounted
Filter Housing Dimensions	390(L) x 215(W) x 590(H)mm
Expansion Tank	12L — 240(L) x 215(W) x 360(H)mm
Booster Pump Voltage	230V / 50Hz
Booster Pump Working Pressure	72 PSI
Booster Pump Flow	130ml/min
Warranty	2 years

What's in the box

• RO system, fully assembled
• All 6 filter cartridges (pre-installed)
• RO membrane (pre-installed)
• 12L expansion tank
• Dedicated sink tap
• Pressure gauge
• Filter housing spanner
• 6W UV unit (With UV variant only)

Choosing the right variant

• Without UV — 6-stage RO filtration including RO membrane and mineral cartridge. No UV treatment.
• With UV — everything above, plus a 6W UV steriliser for an extra layer of protection against micro-organisms.

Frequently asked questions

Is this system right for my home?

If you want high-quality drinking water at your kitchen tap — particularly for fluoride or nitrate reduction — this system is worth considering. It treats water at a single tap rather than the whole house, which keeps the cost down and means you're only filtering the water you actually drink and cook with. If you want filtered water at every tap, a whole-house system is the better fit. Get in touch and we'll help you decide.

What does the RO membrane remove?

The RO membrane removes fluoride, nitrates, bacteria, viruses, calcium (limescale), heavy metals including iron, and organic substances. It is the most effective stage in the system for fluoride and nitrate reduction.

Why is fluoride removed — is that a problem?

RO membranes remove fluoride as part of their normal operation. Whether that's a benefit or a drawback depends on your preference. If you'd prefer to retain fluoride in your drinking water, this system may not be the right fit — get in touch and we'll help you find an alternative. The mineral cartridge in Stage 6 does replenish some minerals after the RO process, but it is not a fluoride re-addition stage.

Do I need a plumber to install it?

The system connects to your cold-water supply via 15mm fittings and includes a dedicated tap that requires a hole in your sink or benchtop. For most customers, a plumber is the most straightforward option — particularly for the tap installation. If you're confident with under-sink plumbing, the connection itself is manageable. If you're not sure, get in touch and we'll help you decide.

Will it fit under my sink?

The filter housing is 390(L) x 215(W) x 590(H)mm and the 12L expansion tank is 240(L) x 215(W) x 360(H)mm. Both need to fit under your sink alongside your existing pipework. Measure your available space before purchasing.

Does it slow the water flow at the tap?

RO systems filter water slowly and store it in the expansion tank, which then delivers it at normal tap pressure. Flow at the dedicated tap is supplied from the tank — 12L of stored filtered water is ready when you need it. The booster pump runs at 130ml/min to keep the tank topped up.

How often do I replace the cartridges?

Cartridge replacement intervals vary by stage. As a guide, sediment and carbon stages typically need replacing every 6–12 months, the RO membrane every 2–3 years, and the mineral cartridge every 12 months. Actual intervals depend on your water quality and usage.

How often do I replace the UV lamp?

The UV lamp should be replaced every 12 months. UV lamps lose effectiveness over time even if they're still glowing. Applies to the With UV variant only.

Is this suitable for rainwater or bore water?

This system is primarily designed for mains water. If you're on a different supply, get in touch and we'll help you work out if it's suitable.

What warranty does the system carry?

This system is covered by a 2-year warranty.