New Zealand's Trusted Water Filtration & Reverse Osmosis Experts

From under-sink RO systems to commercial and ultra-pure industrial water plants — we design, install and service water filtration across the entire North Island and Christchurch. Proudly Kiwi-owned with 20+ years of experience.

20+ Years

NZ water experience

1,800+ Installs

Homes & businesses

Nationwide

Fast NZ-wide delivery

5.0 Rated

Verified Google reviews

Our Services

Water filtration solutions for every New Zealand home, business & industry

Whether you need pure drinking water at the kitchen tap, a high-flow café RO system, or a laboratory-grade ultra-pure water plant — we engineer the right solution for NZ water conditions.

Wholesale & Trade Supply

Trade pricing for plumbers, resellers and wholesalers nationwide.

Filter Replacements & Servicing

Genuine cartridges, RO membranes and scheduled servicing.

Industrial & Ultra-Pure Water

Lab-grade RO/DI systems for industry, medical & research.

Commercial Water Filtration

Cafés, restaurants, offices & hospitality water solutions.

Residential Water Filtration

Whole-home and under-sink RO systems for safer drinking water.

Why The Filter Guy

Engineered for New Zealand water. Backed by Kiwi expertise.

New Zealand’s water varies dramatically — from chlorinated council supply in Auckland and Wellington to bore water in Hawke’s Bay, hard aquifer water in Christchurch, and tank water across rural Northland. Off-the-shelf filters won’t cut it. We design every system around your actual water profile, flow demand and budget.

Custom-engineered

Solutions matched to your water source and usage.

Genuine components

Premium membranes, cartridges and
housings.

Expert installation

Certified plumbing partners
nationwide.

Lifetime support

Servicing, replacement filters and
advice.

Our NZ Water Network

One trusted group.
Three specialist brands.

The Filter Guy is part of a wider New Zealand water filtration group — combining commercial-grade membranes, an extensive online wholesale catalogue and full-service residential installation under one roof.

The Filter Guy

This site · thefilterguy.co.nz

Residential, commercial & industrial water filtration design, installation and servicing across NZ.

Membrane Solutions NZ

membranesolutionsnz.co.nz

High-performance RO, UF and Nanofiltration
membranes for industrial and municipal projects
across NZ.

Wholesale Filters NZ

wholesalefilters.co.nz

Direct-to-trade and consumer online shop for filter cartridges, RO membranes and replacement parts.

Featured Project

Plant & Food Research — Custom RO Installation

In 2023 The Filter Guy delivered a custom dual reverse osmosis treatment solution for a leading Plant & Food Research facility in New Zealand. Two MO1000 RO systems with Watts One™ DI resin cartridges feed gravity-fed storage tanks on level 7, supplying ultra-pure water to all laboratories and
greenhouses below — without additional pumps.

Service Areas

Servicing the entire North Island & Christchurch

From Whangārei to Wellington — and across to Christchurch in the South Island — our installation, servicing and supply network covers every major NZ city. Click your location for tailored water information.

Auckland

Wellington

Hamilton

Waikato

Tauranga

Bay of Plenty

Rotorua

Bay of Plenty

Napier & Hastings

Hawke’s Bay

Palmerston North

Manawatū

New Plymouth

Taranaki

Whangārei

Northland

Gisborne

Christchurch

Canterbury

What our NZ customers say

“The whole-house filtration system The Filter Guy installed transformed our water — clean, soft and fresh from every tap. Highly recommend.”

— Emma R., Auckland

“Installed a commercial RO for our
café — smooth installation, great
pricing, and ongoing support has
been excellent.”

— Michael T., Wellington

“As a plumber, I rely on The Filter Guy for trade pricing and expert advice. They make my installs easier.”

— David L., Christchurch

“Bought the Direct Flow RO 800GPD outstanding water quality and easy filter changes. Truly dependable.”

— Sophie M., Hamilton