Can I make water with a marine reverse osmosis system while underway in a boat?
• Yes, you can, but be careful to keep the through-hull, which is the intake for the marine water maker, well below the waterline. The reason for this is that the feed pump, or the low-pressure pump for the water maker, requires a flooded suction. If excessive air is introduced into the feed pump, the feed pump will lose its “prime” and the water maker will cease to function due to a lack of a feed water stream. In that case, the low-pressure pump would need to be “re-primed”, after which the water maker would function properly again. So if you intend to make water while underway, make sure that the intake through-hull is placed in such a position so that it does not take in air when the vessel is underway.
