What to Know Before Installing a Water Filtration System
Installing a water filtration system is one of the best ways to protect your household’s water supply.
Whether your home is supplied by rainwater, a bore, spring, or town water, the right filtration system provides peace of mind that your water is clean, safe, and ready to drink.
However, choosing a filtration system is about more than simply picking one off the shelf.
The size of your home, your water source, and even where the system will be installed all play an important role in how well it performs.
In this guide, we’ll walk you through the key things to consider before installing a filtration system. If you’re unsure which setup is right for your property, our expert team is always happy to help point you in the right direction.
Start with Your Water Source
The first thing to consider before choosing a filtration system is where your water comes from. Every water source has different characteristics, so understanding your supply helps determine the type of filtration you need.
Rainwater
Rainwater is the most common water source we see across New Zealand. As it is collected from your roof, it can carry leaves, dust, bird droppings, and other organic matter into your tank. Sediment filtration and UV treatment are essential to produce safe drinking water.
Bore or Spring Water
Bore and spring water may contain naturally occurring minerals such as iron or manganese, along with bacteria and other contaminants. A laboratory water test is the best way to identify what treatment your water requires.
Town Supply
Although town water is already treated, many homeowners still choose to install filtration to improve taste, reduce sediment, or provide an extra level of protection for their household.
Understanding your water source first ensures you install a filtration system that suits your property’s specific needs.
How Many Filters Do You Need?
While filter size is important, one of the biggest decisions is choosing how many stages of filtration your system should have. For most households, we recommend a 20-inch system to provide good water flow and longer filter life, particularly if you have more than one bathroom.
Single Filter Systems
Single filter systems offer only basic sediment removal and are generally not recommended for drinking water. If paired with UV filtration, a single filter often means compromising between water pressure and UV performance, as one cartridge cannot effectively remove both larger and finer sediment particles.
Dual Filter Systems
A dual filter setup is the most common choice for New Zealand homes and is what we recommend for most households. The first sediment filter captures larger particles, while the second, lower micron filter removes much finer sediment before the water passes through the UV system. This allows the UV light to effectively neutralise bacteria without larger particles shielding them.
Triple Filter Systems
If your water has noticeable taste, smell, or colour issues, a triple filter system may be the better option. These systems add a carbon filter after the sediment filters to remove unwanted tastes, odours, and natural pigments before the water reaches the UV unit.
If you’re unsure which setup best suits your water supply, our team can help recommend a system based on your water source and household needs.
Do You Need UV Filtration?
If your household drinks tank water, UV filtration should be considered an essential part of your system. Sediment filters remove dirt and particles from the water, but bacteria are far too small to be captured by traditional filter cartridges. UV filtration is the only continuous method of neutralising bacteria without adding chemicals to your water.
Without UV filtration, your household may remain exposed to bacteria introduced through:
- Bird or animal droppings on the roof
- Organic matter entering the tank
- Heavy rainfall washing contaminants into the system
- Naturally occurring bacteria in untreated water supplies
For homes relying on untreated water, UV filtration provides year-round protection and peace of mind.
Choose the Right Installation Location
Where your filtration system is installed is just as important as the equipment itself. Ideally, the system should be positioned after the pump and before the water enters the house.
Common installation locations include beside the tank, underneath the house, inside the garage, or within a dedicated pump shed. Wherever it is installed, future servicing should always be considered.
Leave Room for Maintenance
Filters and UV bulbs require regular replacement throughout the life of the system, so accessibility should never be an afterthought.
Before installation, consider:
- Is there enough room to remove the filter housings?
- Is there adequate clearance underneath to replace cartridges?
- Can the UV chamber be accessed easily?
- Is there a nearby weather-protected power outlet for the UV system?
- Will the area still be accessible once landscaping or storage is added?
Planning these details during installation makes routine servicing straightforward and helps your filtration system perform at its best for years to come.
Winter Maintenance Tip: During the colder months, ants are often attracted to the warmth produced by UV systems and may nest inside or around electrical components. Placing ant bait stations nearby before winter can help deter them and protect your filtration system from avoidable damage.
Think Long Term
Like any part of your home, a filtration system works best when it is designed with future maintenance in mind. Choosing the correct filter size, allowing enough installation space, and using quality equipment all contribute to a system that is easier to maintain and more reliable over the long term.
Just as importantly, remember that tank cleaning and filtration work hand in hand. Your filtration system provides ongoing protection by removing sediment and neutralising bacteria between tank cleans, but as sediment gradually builds up inside the tank, it begins to impact the system’s performance. Larger amounts of sediment will clog filters more quickly and reduce the effectiveness of UV filtration by shielding bacteria from the UV light.
For the best results, we strongly recommend having your water tank professionally cleaned before installing a new filtration system. Starting with clean water allows your filters to perform as intended from day one, extends the life of your cartridges, and gives your household the highest level of protection.
Get Your Filtration System Right from the Start
A filtration system is one of the most valuable investments you can make in your household’s water supply, but choosing the right one starts with understanding your water source, your household’s needs, and how the system will be maintained in the years ahead.
At Safe H2O, we help kiwi homeowners choose filtration systems that suit their property, not just what’s on the shelf. Whether you’re installing a new system, upgrading an existing one, or simply want advice on the best setup for your home, our team is here to help. Get in touch today and let us help you build a filtration system that keeps your water clean, safe, and reliable for years to come.