A lock full of water is a bit more than a bathfull. By taking a bath and emptying it into the canal it could be argued that you're helping by topping up the canal a bit. Err, you don't use soap, bubble bath, shower gel do you? I guess a small amount might not hurt too much but a lot might harm the wildlife. The K&A is a bit weird in asking for each lock to be filled and emptied at each use, normally only half of that water is wasted. I like doubling up with boats, it's really nice working with another crew to see what i can learn from them to get the boats through faster. A couple of months ago we had a couple of really hot weeks and i was about ready to brave swimming in the canal but the next time i got to the boat the water was all iced over, so i didn't