We stayed in a very nice pub at the weekend, but the room had a duel flush toilet that used gallons of water. Why? Because after you flush it, it continued to let water pass through at a trickle continuously, and the pump that topped it up kept starting intermitently. Valve based systems are prone to this, and require proper maintenance. As such, we need to look at where such systems are really appropriate beyond how much they use when they're new.
If they are likely to suffer from a lack of maintenance they will use far more water than any other toilet.
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In my Joy Division Oven Gloves"
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