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I have 2 low flush toilets = 6 litres per flush, never had them block up but the sewer that serves mine & 2 other houses blocks up regularly, all 3 houses now have low flush toilets. The water company has put a float valve switch connected to the cell phone network in the manhole to tell them when it blocks up, a man comes to change the battery every 2 to 3 years. It saves me money as I'm on a water meter which is fairly unusual in Britain as most people are on a flat rate that is based on the house/apts value & takes no account of how much water is actually used...
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