- Advantages - Use your water twice
Substitute more than half of the water you use by using it twice. Some of the benefits of using your water twice are; to use this water for WC flushing, washing machine and outside tap(s) and to lower the cost of your water bill. Other advantages are; to water your lawn, wash your car and pressure wash your drive when there is a hose pipe ban in force.
- What is greywater?
Greywater is residential wastewater that is free of faeces and highly contaminated kitchen wastewater. The definition of Greywater is water from the bath, shower and wash hand basin.
- Greywater System, water quality
Greywater system technology is gaining importance alongside rainwater harvesting systems. The adopted water quality standard for both grey and rainwater systems is the; "European Recreational Water Standard"
- What is Clearwater?
Clearwater is the cleaned water having gone through the greywater system process of; sedimentation, aeration and filtration, resulting in Clearwater that is suitable for re-use, Clearwater is hygienically safe.
- Greywater is an inexhaustible resource
Greywater is a constant; it is generated every day from baths and showers, - unlike rainwater from the roofs which is not an everyday event. This is why greywater systems tanks are much smaller, unlike rainwater tanks which need to be large enough to store a 14 day supply, as it may not rain significantly for 14 days.
- Clearwater from greywater systems can be used for
WC flushing - washing machine'-'car washing'- 'garden irrigation - cleaning etc
- Design of a greywater recycling system (minimum of two tanks)
Membrane Greywater recycling systems require a separate pipe network from baths, showers and whb to discharge by gravity into the greywater tank(s). The greywater tank has a gravity overflow to foul and tank to tank connection to the Clearwater tank. The cleaning process of greywater consists of; sedimentation, aeration and filtration, after which the cleaned greywater is pumped into the clearwater tank by means of a transfer pump. The Clearwater is then pumped direct to point of use by a submersible pump.
- Savings potential
Environment Agency figures state that the average usage of water in a typical home per capita, per day is 135ltr; 33% for WC flush, 12% washing machine and 7% outside tap, a total of 52%. Using water twice reduces the load on the drinking water supply and the amount of wastewater discharged to foul. Ideal situation where foul discharge is connected to a septic tank for instance, reducing the frequency for emptying the tank.
- Areas of application for greywater recycling systems
Greywater recycling systems are most useful where people live and generate large amounts of Greywater through bathing and showering. Typical scenario could be for high rise apartment blocks where the roof area is small making a rainwater harvesting system impractical
Houses, apartment blocks, hotels, nursing homes, leisure centers etc, etc
- Combine Greywater Recycling with Rainwater Harvesting
It is also possible to have a combined Grey - Rainwater system; this greatly increases the amount of available Clearwater for reuse. To achieve this, the small Clearwater tank of the greywater system is replaced with a larger rainwater tank c/w integrated rainwater filter. Rainwater is collected direct from the roof into this rainwater tank. Greywater is processed in the normal way; cleaned greywater is pumped from the Greywater tank into the rainwater/clearwater tank where greywater and rainwater come together. The Clearwater is then delivered to point of use by a submersible pump.