Practical, plain-language guidance on choosing, installing and maintaining water storage, written by the Promax team.
Lead times, raw material prices and drought all push in the same direction: buy the tank before you need it. Promax's answer was the Promax Promise, which locks in the delivery and the original price.
Read the guideGroundwater around an empty underground tank can compress its walls until they collapse inward. Here is how hydrostatic crush works, how it differs from flotation, and the two ways to design it out.
Read the guideConcrete and asphalt stop water soaking into the ground, which drives runoff, cuts groundwater recharge and carries pollutants into waterways. Dual purpose tanks tackle it by doing detention and retention in one tank, which also satisfies SMAF controls.
Read the guideGreywater reuse puts water back into jobs that never needed drinking quality in the first place: toilet flushing, laundry and irrigation. Here is what it saves, and where a Slimline tank with a built-in pump and changeover device fits.
Read the guideOne-piece construction, built-in seismic restraints and fewer connection points. How Promax underground and slimline tanks are designed for ground that moves.
Read the guideGround movement is not only an earthquake problem. In Auckland, where seismic activity is low but the clay is highly expansive, the soil moves with every wet and dry cycle. What that means for leak risk, B2 durability, liability and repair in integrated water systems.
Read the guideCustomised Chassis Builds for Promax Dust Suppression Units
Read the guidePoly rainwater tank prices vary widely, and a cheap tank is cheap for a reason. The saving usually comes out of the design, the raw materials, the fittings or the warranty.
Read the guideKiwi sections are shrinking, and the Promax Slimline is built for that: a narrow tank that sits along a fence or behind the house, with seismic restraints already built in.
Read the guideEmpty underground tanks are buoyant, and on flood-prone or high groundwater sites they will float. Uplift restraints strap the tank to concrete-filled boxes to hold it down, and you need roughly one set for every 1,000 litres.
Read the guideENDURO tanks have corrugated sidewalls and can be inset up to 1 metre in the ground; XPRESS tanks are smooth-walled, come in two colours and carry a budget-friendly price. Both are built to AS/NZS 4766.
Read the guideEven the smallest Promax tank can provide thousands of litres of water every year. Capacity is only a guide: a tank that keeps refilling punches well above its size.
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.
