The water in the home has for many years been thought of as very clean water for drinking or potable water. As it flows into the house new and fresh via the mains water supply and then leaves as sewage. However this waste water from our washing machines, sinks and dishwashers sits in between and is called grey-water and is in the region of 60-80% of a homes waste water.Basic Process:Now who would have thought that you could take all the grey-water that is produced from your sinks, wash basins, and your bath and shower too and feed it to a storage tank. You could take waste as well, however, you need to ensure that oils and food waste are not washed down the drains. Plumbers can advise on grey water. Once it arrives in the tank, the waste will sediment out, with all the light scum rising to the top and then running down a drain. A heavier sediment is also present, but this falls to the bottom of the tank and is flushed away every so often away to the soil stack. Believe it or not the water that now sits in the middle of the tank is really quite clear, not to drink, but use to flush a loo. Bacteria forms in just over 24 hours so storage is quite risky and short lived.The system will need to be flushed automatically before this limit is reached. You also need the back up of mains cold water fed from a tank with an air gap and a weir overflow, and would probably be built into the system, for when grey water is not available. 1). The positive side of these types of systems is that there is no need for a large tank buried in your garden, which means that the complete installation cost would be low. 2). The negative is that you dont collect as much water there is a risk of foul smells coming from the flush water itself. A Plumber uses safe practices.3). There is no real reason why you couldnt combine grey water and rainwater harvesting, so the grey water supplies the water for the toilet and the rainwater used in the garden and perhaps the washing machine.

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