- 5.0 Star Rated · 1,800+ Installations
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 of NZ water expertise
- 1,800+ homes & businesses served
- Nationwide delivery & installation
- 100% Kiwi-owned & operated
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.
Residential Water Filtration
Whole-home and under-sink RO systems for safer drinking water.
Filter Replacements & Servicing
Genuine cartridges, RO membranes and scheduled servicing.
Wholesale & Trade Supply
Trade pricing for plumbers, resellers and wholesalers nationwide.
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.
- 70% reduction in long-term service & maintenance costs
- Laboratory-grade purity below 5 µS/cm
- Energy-efficient gravity-fed design
- Spectra Guard dosing — no traditional softener required
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.
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
Frequently Asked Questions
What is the best water filtration system for New Zealand homes?
The best system depends on your local water quality and household needs. For most NZ homes, we recommend a whole-house filtration system to remove chlorine, sediment, and odour, often paired with reverse osmosis (RO) for drinking water. We assess your water supply (council, tank, or bore) and recommend a system that balances performance, cost, and long-term maintenance.
Do I need a water filter if I'm on council water in NZ?
Council water in New Zealand is treated and safe to drink, but it often contains chlorine, sediment, and trace contaminants that can affect taste, smell, and long-term exposure. A filtration system improves water quality, taste, and appliance lifespan, making it a popular upgrade even for homes on mains supply.
How much does it cost to install a water filter in New Zealand?
Costs vary based on system type and property size. Basic under-sink systems typically start from $300–$800, while whole-house systems range from $1,500–$5,000+ installed. We provide custom quotes based on your water source, usage, and installation requirements.
How often should water filter cartridges be replaced?
Most cartridges need replacing every 6–12 months, depending on water quality and usage. High-demand systems or poor water conditions may require more frequent changes. Regular replacement ensures consistent water quality and system performance.
Do you service rural properties on tank or bore water?
Yes, we specialise in rural water filtration systems for tank and bore supplies. These often require multi-stage filtration, including sediment removal, UV sterilisation, and sometimes iron or manganese treatment. We design systems to handle variable water quality and seasonal changes.
Do you offer trade pricing for plumbers and resellers?
Yes, we offer competitive trade pricing for plumbers, builders, and resellers across New Zealand. Trade partners benefit from bulk discounts, technical support, and fast nationwide delivery, making it easy to supply and install reliable filtration systems.
Get a free water filtration assessment today
Talk to a Kiwi water specialist. We’ll recommend the right system for your home, business or facility — backed by 20+ years of experience.