Primary Rainwater Filters
Years of experience has proven that primary rainwater filters are one of the most important items in a rainwater harvesting system. These filters are installed before the rainwater enters the rainwater tank. and they should be able to dynamically filter the rainwater while it rains. The purpose of these filter are twofold
- Prevent access of insects, reptiles and vermin into the rainwater system. It thus technically seals the rainwater system from outside entry.
- Prevent large debris and organic material from entering the water storage system. It must be able to filter our large debris before it can enter the tank.
We recommend the use of WISY primary rainwater filters in all systems.
Tank overflow protection system
Overflow protection for a rainwater tank is very important design feature.
By using a well designed overflow system you will protect vermin and insects from entering your rainwater tank. The overflow system is at the tank overflow which can be situated just inside or ourside the tank. In underground tanks it is a critical requirement as it also protects the tanks from any back-flow that might occur in the underground storm-water piping.
Example are the Wisy multisyphon overflow (see below). It is made of impact-resistant ABS plastic. It has a 100mm or 200mm connection . Surface debris is removed by a skimming effect. It prevents storm drain odors from reaching the storage tank. A Brace pipe prevents tilting or tipping.
Floating suction filter
A floating sution ensures that the best quality water is maintained in your rainwater staorage system at all times. While the slow inflow at the bottom introduces the oxygen rich water to the bottom of the tank, the floating suction pulls the old water from the top. The floating suction has a 2mm screen that prevent any object that might accidentally enter the tank from entering the suction line and damaging your rainwater pump. The floating suction is connected to your rainwater supply pump. When the pump activates it withdraws the water just below the surface of the water in the rainwater tank. Technically it is the oldest water that you want to use first.
Smoothing rainwater inlet
The smoothing inlet is critical in maintaining the water quality within a rainwater tank. It is intalled on the water inlet pipe to the tank and is positioned at the bottom of the rainwater tank and directs the incoming water upwards in the tank. It serves a number of functions:
- It prevents the agitation of sediment at bottom the rainwater tank. Good microbes resides within the bio-layer at the bottom of the tank and assist in removing bacteria and harmful elements in the water. By not disturbing the bio-layer the water quality improves
- Introducing the fresh water at the bottom of the tank ensure a supply of oxygen to the microbes in the bio-layer assisting them in performing their cleaning function.
The smoothing inlet is an all stainless steel device that fits on the 100mm or 200mm or inlet pipe in the rainwater storage storage tank.
Pressurized water purification systems
We recommend an "on demand" pressurized water system for rainwater harvesting systems. Using our extensive experience in the field we have developed an number of purification systems, of which the most popular is our "plug and play” system for the purification of rainwater from a rainwater tank. This will purify harvested rooftop rainwater to potable water quality standard for any household or community. - Ideally suited for a 5-6 person household in a multistory house or for a small community with a centralized rainwater harvesting system.
The unit pre-set and tested to 5 Bar in our factory and can be installed and connected by a good plumber and an electrician.
The system consists of:
- A stainless steel frame (1.2m x 0.65m x 0.9m) which can be easily transported and protects the whole system.
- A booster pump set that will provide 40l – 50l of purified rainwater per minute at 3.5 to 5 bar. The pump is coupled to a Global Water Solutions’ 24 litre PressureWave® series pressure tank. The pressure tank increases the longevity of the pump and reduces the energy consumption of the system, which makes it perfect for solar installations. The design and construction of the PressureWave® pressure tank ensures that the system will operate reliably and efficiently for many years without the need to replace EPDM bladders or recharge the air in the cylinder. Pump control is provided by Global Water Solutions’ PumpWave® series electronic pump controller. The controller is designed to work in conjunction with the pressure tanks. The cut in pressure can be adjusted from 1.9 to of 3.5bar which is very useful when the system is used in multi-story buildings. The controller protects the pump from dry running when there is no water left in the tank, removing the need for a float switch.
