It's a great system and it works as advertised
But unless your tank is at least 40 gallons or more than 20" deep, you don't need to spend that kind of money to keep your tank odor free...passive ventilation above the surface can do it.Besides, it has to run 24/7/365 (except during winter layup, of course), so it wouldn't work on a boat that's on a mooring or trailer or in a slip without shore power.For those unfamilir with the Groco Sweetank, it's a holding tank aeration system...you can read all about it here: http://www.groco.net/parts/data/622.pdf