Back on the old water maker chestnut. Looking to do extensive cruising into the Indian Ocean and would like to have a reliable (as possible) water maker on board.

Currently thinking of buying a Honda petrol genny to run it, but don't want to do this every day. I was chatting to a liveaboard here and she said they run their water maker once every two weeks because their system takes the last few litres of filtered water to back-wash it.

Can anyone advise me on what makes do this, which ones are recommended, reliable blah blah blah...any comments?