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The Ecohome : The basement The basement contains a rainwater storage and reuse system, and the WC composting system.
Rainwater harvested off the roof, makes its way down through the copper guttering and downpipes, passing through filters and is collected in two polypropylene tanks with a total capacity of around 2000 litres.
The other parts of the rainwater kit consist of a level sensor linked to a controller, which trips an automatic mains water top up when the level is too low. The pump automatically switches on when the washing machine or external tap is turned on or a WC flushed and supplies the rainwater. If the tanks get too full, the excess runs off to the mains drain.
The WC composting system has been used to address the highest source of pollution from houses after CO2. The chosen system is a hybrid combining the benefits of a flushing WC with a composting system to deal with solid waste.
Efoetida worms were added to the composting chamber. The worms, which are similar to those used in worm bins, aid the composting process by digestion, speeding up the rate at which the solids are reduced.