Rainwater Harvesting
Fresh water is an increasingly scarce, precious and expensive resource.
Saving water is now an essential part of our drive to a sustainable society.
Delivering clean tap water requires more and more effort, energy and expense.
Harvested roof rainwater is not only a free resource, but it is ideal for use in washing machines, toilet flushing and garden watering, in homes, in commerce, in public buildings and in industry.
Our products, with their individual proven designs, are available to meet the widest possible range of uses in rainwater harvesting and management.
A Typical Rainwater Harvesting System
Rainwater Harvesting treatment systems normally incorporate a number of filtration phases briefly described below:
- Catchment Area - The roof of your building is the most commonly used catchment area. Water is directed to storage tanks via gutters and down pipes. It is important to clean the catchment area regularly to ensure no leaf and sediment buildup.
- First-Flush Devices are an important part of effective rainwater harvesting. These strainers ensure that the initial run of water off your roof which could contain leaves and debris is discarded.
- Storage Tanks - ensure your storage tanks are kept clean and preferably not located under trees where leaves can foul the inlet strainer. It is important to regularly have your tank cleaned and disinfected in order to provide high quality water to your home.
- Pressure Pump - When choosing a pump for your harvesting system, consider the flowrate and pressure required for your home or property. As a guide, allow 10 litres per minute for each tap that could be used simultaneously in the home. For instance, the washing machine, the shower, the kitchen sink and the garden tap could all be running at the same time meaning you need 40 Litres per Minute flowrate. Pressure is also important. Many small pump datasheets will display the maximum flow and maximum pressure which can be confusing. Advise your dealer that you require your flowrate at 250-300 kPa (Kilopascals)
- First Stage Filtration is used to removing all the fine sediments and debris that may be in your rainwater. Backwashing Screen Filters are often used as they are easy to clean without stopping the supply of water to the home.
- Second Stage Filtration is used to remove the finer sediment from the water. Cartridge Filtration or Bag Filtration is normally used for this application and mostly rated to 5 Microns.
- Ultraviolet Disinfection is a popular method of disinfecting rainwater. Due to potential sickness caused from bacteria such as cryptosporidium and giardia, it is advisable to install some sort of disinfection prior to entering your home or office.
Rainwater Point-of-Entry with UV
