This is a smart patented product from Australia. It accumulates about 9 litres of water from sinks and toilets and then dumps it into the sewage pipe in one go to ensure self cleansing velocity. Water efficient dual flush toilets may go down to 6/3 litre flushes, this may block drains because there is not enough water for self cleansing. The drainwave product does the job however www.drainwave.com.au for more details
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