Here's what I've been doing on my 2006 Maristar 200. Run the pumps on empty until tanks are empty. Hook a fake a lake to ballast intake on bottom of boat and suck 1 gallon of RV anti-freeze into each of the 3 tanks. Run the pumps on empty until a little anti-freeze spits out the through hulls. If you're set up with a factory system you should have the two way Jabsco ballast pumps.
2006 Maristar 200 SS