Have you ever asked yourself why on earth are we going to all of the effort and environmental impact to purify water to drinking quality then flush it down the toilet? It boggles the mind! If you put that on a commercial level, some might say that it’s crazy!
A commercial rainwater harvesting system will collect the rainwater that has fallen on the building’s roof, filter it and pump it to your toilets, urinals, vehicle wash facility, etc. So we can conserve the mains water for better use. Unsure of which system is correct for your installation, please fill in the form below and we will let you know.












Collected rainwater is pumped from the underground storage tank via a submersible pump to a low-level break tank situated in the building.
From here, rainwater is pumped from the break tank via the booster pump system to the points of use, toilets, urinals, etc.



During rainfall, rainwater that has fallen on the roof of your building is supplied by gravity to the storage tank via a pipe network and filter system. Rainwater passes through the integrated filter removing large particles, such as leaves, twigs, etc. before entering the tank.
Once the rainwater is in the tank it is then pumped by the submersible pump in the storage tank to either the header tank (if using the Rainbox Gravity) or the break tank booster system (if using the Rainbox Combi). Form here it is pumped or fed by gravity (depending on the system ) to the points of use.


If there has been more rain than needed and the tank is at capacity, an overflow system is engaged and the excess water is piped by gravity to the storm drain via a one-way valve to prevent contamination in the tank.
Vice versa, if there hasn’t been much rainfall and your tank is running low then the control switch system is engaged and mains water is introduced into the tank, but only the minimum required. Thus leaving maximum capacity to receive the next rainfall.
These techniques keep your system running smoothly.
As well as the integrated filter, the overflow system also helps keep the rainwater and system clean by removing the scum layer (tiny particles, etc.) from the water surface in the tank.
These processes, along with a regular system service will keep the tank(s) and the entire system as healthy as possible and have your system running at optimal performance, always!


With our systems, you have the option to have a 6000, 8000, 10000, 12000, 14000, 16000-litre GRP underground water tank.
With the Gravity-Fed system, you can choose either a 500, 1000, 1500, 2000-litre GRP header tank.
