Thats all Ive ever used. I ran my 25 in saltwater 3 days a week for 8 years. First thing I did when I got home was flush the engine with freshwater using the muffs. Two things, make sure that when you start your engine that water is ejecting out the "pisser", if not stop engine immeidately and repostition muffs. And, keep an eye on the engine while flushing so that the muffs stay postioned and or dont fall off with out you knowing it. Those things are fine, no need for a 55 gallon workout.