this is a really cool product. I just got mine a week ago and love it for wash downs after surf fishing… Check out the website and video RinseKit
it holds about two gallons, doesn’t require batteries or compressed air, just fill it up with your garden hose, throw it into the back of you car and your good to go. Retails at $89. Here’s the ticket, go to Sport Chalet, if they are out of them, special order it, they will ship it to your home for free.
flies, sand & surf 
This would work great with a product called Salt Away. It is available from Amazon. It is made by a company of the same name in Santa Ana California. I use a 2 to 5% solution.
Does this count against my water issue for the month???