Maintenance, Troubleshooting & Handover | Using Rainwater at Home
Keeping a home rainwater reuse system reliable: the routine checks, the signage that matters, how to diagnose the common faults, and what a good handover includes.
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Articles | Knowledge Hub
Make Better Decisions About Water Storage
Practical, plain-language guidance on choosing, installing and maintaining water storage, written by the Promax team.
How Tank-to-Mains Systems Work | Using Rainwater at Home
What happens when your rainwater tank runs empty? A changeover device switches the house to mains and back without you touching a thing. Part one of the Using Rainwater at Home series.
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What is The Difference Between A Detention Tank And A Retention Tank?
A detention tank and a retention tank look identical and are both stormwater tanks. A detention tank slowly releases water to the stormwater network; a retention tank holds it for you to use.
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How To Clean Your Water Tank
The cleaner the water going into your tank, the less often the tank itself needs cleaning. This covers inlet filtration, the in-tank accessories that keep the floor clear, hiring a professional, and how to clean a tank safely yourself.
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The Truth About Concrete Tanks
Concrete water tanks are sold on four claims: that they are cheap, strong, keep water pure and are easy to clean. Each one is worth testing before you buy on reputation.
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TP108 Water Collection Guidelines
TP108 sets out how stormwater mitigation is calculated and managed. What the guideline covers, and how Promax calculators based on it size detention and retention tanks.
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Do I Need A Consent For A Water Tank?
Only the council in your region can tell you whether your tank needs building or resource consent. Rules differ from district to district and change often, so make the council your first call.
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6 Reasons Why Builders, Drain Layers and Plumbers Choose Promax Slimline Tanks
New Zealand sections are shrinking, and the tanks that fit them have to work harder. Six reasons builders, drain layers and plumbers reach for a Promax Slimline Tank.
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Different Types of Fittings for Industrial Tanks
Promax offers three fitting types for industrial tanks: stub spigot and backing ring, PE pipe, and BSP spigot adaptor. Here is what each one suits, and where each one runs out.
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Not all poly tanks are made equal
Two poly tanks can hold the same litres and look much alike from the driveway. Ten reasons a Promax rainwater tank is not the same tank as the cheaper one beside it.
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SMAF Stormwater Rules
SMAF, or Stormwater Management Area Flow, is a component of the Auckland Unitary Plan that splits stormwater management into SMAF 1 and SMAF 2 areas. This is an orientation to what the framework covers.
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How To Install Your Water Tank
Water tanks as good as ours deserve the highest standards of installation.
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Explore Our Range
Shop Popular Categories
Browse Promax tank categories for residential, rural, commercial, and specialised applications.
Water Tanks
Reliable Storage
Water Tanks
Durable above-ground water tanks for rural, residential, and commercial storage.
Underground Tanks
Space Saving
Underground Tanks
Underground water storage for sites where space, access, or visibility matters.
Slimline Tanks
Built for Tight Spaces
Slimline Tanks
Narrow-profile tanks designed for homes, boundaries, and other restricted spaces.
Industrial Tanks
Heavy Duty Solutions
Industrial Tanks
Specialised tanks for demanding commercial, industrial, and process applications.