Many people in France live on boats and apart from mooring cost the only other great expense is fresh water. The port authorities have a monopoly on this, thus charge a premium for it so the boat owners started looking and exploring options. A friend who is part of this boat owners community has tried and tested the alternative which bascially is pumping in and filtering river water to a very pure state. Bacially they have a series of filters like below 20" x 4.5 25 Micron sediment 20" x 4.5" 10 Micron Sediment 20" x 4.5" Carbon Block filter 20" x 4.5" 1 Micron sediment 6 gpd UV fitting This water is now used for everything from toilets to showering but filtered again with a reverse osmosis system for drinking and food prep. areas. Just thinking that this option might also suit anyone else who has access to a water source.