If a rainwater system is designed and installed correctly and if the water is treated correctly it is extremely safe to drink. By implementing our design philosophy and using the correct equipment a rainwater harvesting system can deliver potable quality water that exceeds the quality of municipal water.
In the first stage of collecting water, like any water supply system, the water being collected is exposed to all different kinds of external contaminants.
In municipal water supply systems, water is collected from rivers or dams. Rivers and dams are polluted by ineffective municipal sewerage plants, illegal dumping by companies and just general human pollution from people staying along the edge of the water source. Our water sources are becoming more and more polluted as industries and populations grow and municipal infrastructure and effective management declines.
Rainwater is unpolluted when falling from the sky. It only contain small amounts of trace elements. In a rainwater capture system it is important to control the area of collection (roof) to minimize the risk of contamination.
When falling on a roof the rainwater will come into contact with dust, airborne contaminants and organic material. The first part of a harvesting system will be to prevent large pieces of organic material (i.e leaves and other plant components) from entering the collection system. This is achieved through an ingenious small particle separator system connected to the buildings gutters.We recommend that you screen the incoming rainwater down to at least 380micron (0.38mm). By removing all the organic multilateral you ensure that the rainwater in the tanks are as clean as possible.
A system should be designed so that there is no stagnant water anywhere in the collection system as this can result in possible contamination.
The inflow system into the tank should be designed so that the the water in the storage tank is oxygenated with fresh water resulting in the prompt breakdown of any organic material that had found its way into the rainwater storage tank.Storage tanks are made of food grade material with a black liners that prevents algae growth. All connections to the rainwater tank should be covered and sealed so that no animal or insect can enter the storage system.
A four step treatment system should be implemented if you want to convert the rainwater to potable water. We recommend a pressurized water purification unit. In this unit the rainwater is filtered, in three stages and then sanitized with a high intensity UV light. Rainwater treated in this process is completely safe to drink.