If you are doing 5 gallons or less (like I do for my nano), I just use one hose. I siphon waste water to one bucket and when it is filled, I put my finger on both ends of the hose, put one end into my sump and the other in the fresh salt water bucket, which I have elevated on a salt bucket and let it siphon back into the sump. I have small clamps on both ends, so it doesn't move while siphoning. Easy as it gets. No splashing, no pumps, etc. Just gravity. 

. The nice thing about the DOS is your water station can be up to 30 ft away lets say in a basement or garage. The DOS is a bit noise and to quite the DOS I used erasers on the back of the mounting board and lubed the plastic fronts of the head to stop the clicking with silicone grease. I like the part the I can control the amount on water I would like to change down the the 1 ml. My water drain out of a drain line I ran to the outside world.

