Rainwater / tank water

On rainwater or tank water

On a tank, you look after your own water. Whatever comes off the roof ends up in the tank, so most homes start with sediment filters, then add UV if they drink it.

What's typically in NZ rain and tank water

Private rainwater supplies in New Zealand aren't treated or checked by a council, so filtering, maintenance and testing are up to the owner. Here's what people usually deal with.

Dirt and debris from the roof

Rain picks up leaves, dirt and grit from roofs and gutters on its way into the tank. A sediment filter catches those particles before the water reaches your taps.
Bacteria and other microbes

Tank water can carry bacteria, viruses and protozoa. Filters on their own don't deal with those. UV is designed to treat them, which is why we suggest a system with UV if you drink your tank water.
UV needs clear water

UV light has to reach the water to work, so sediment filters go first to take out dirt and particles. Change the UV lamp once a year: it can still glow after 12 months but may no longer give reliable treatment.
Taste, smell and low pH

Water stored in a tank can pick up a taste or smell, and a 3-stage system adds a carbon stage for that. Rainwater also often has a lower pH, which can lead to pipe corrosion and a metallic taste. Ask us if that's a concern.

Pick how you want to filter it

Choose a full system with or without UV, add UV to the filters you already have, filter just the kitchen tap, treat the tank itself, or pick up your yearly UV service kit.