Practical, plain-language guidance on choosing, installing and maintaining water storage, written by the Promax team.
Concrete tanks can be buried and keep water cooler; plastic tanks cost less, take new outlets easily and flex in an earthquake. Here is the honest comparison, including where concrete wins.
Read the guideA 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.
Read the guideThe 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.
Read the guideConcrete 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.
Read the guideTP108 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.
Read the guideOnly 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.
Read the guideNew 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.
Read the guideSeismic restraints anchor an industrial tank's base to a concrete pad so it cannot move in an earthquake, cyclone or flood. Here is what they do, and why New Zealand's seismic record makes them essential rather than optional.
Read the guidePromax 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.
Read the guideTwo 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.
Read the guideA dual-purpose tank detains stormwater in its top section and retains water for reuse in the bottom, so the same tank that satisfies the council also feeds the laundry, the toilets and the outside taps.
Read the guideSMAF, 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.
Read the guideBrowse Promax tank categories for residential, rural, commercial, and specialised applications.
Durable above-ground water tanks for rural, residential, and commercial storage.
Underground water storage for sites where space, access, or visibility matters.
Narrow-profile tanks designed for homes, boundaries, and other restricted spaces.
Specialised tanks for demanding commercial, industrial, and process applications.
