All those things are true. We could make fresh water out of the sludge that passes for water in a busy port, sluicing out the sludge with the brine and not caring a whit. We certainly had energy available sufficient to do whatever we wanted. Submarines survive on stealth, not speed, and at a flank bell we sounded like a freight train. If I had a dollar for every time I had the reactor above 75% of its capacity during routine operations I couldn't buy lunch. And since that reactor required us to consistently provide it with makeup fresh water under the adverse conditions of tooling around in a submarine, reliability vastly outweighed efficiency for us. Still (pardon the pun), I was thinking "they have to be more efficient, probably ten, maybe twenty percent". You have expanded my perceptions here. Thanks.