Below I will try to outline some of the alternatives available to the common Water Closet type water flush toilet.

Oil Recirculating Toilets don’t use water. They are closed loop systems where mineral oil is used to flush wastes away rather than water. Oil and waste is collected in a storage tank where the waste sinks to the bottom and the oil floats to the top. The oil is then filtered off from the top of the tank, filtered and fed back into the cistern ready to be reused. Meanwhile

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