[Jim Gilly]

I think you will find any quality tank additive (West Marine) will do a good job, try several till you get results you like. Just follow the manufacturer's directions, pouring the proper volume/quantity into your toilet and then flush. I too have experienced difficulty pumping out my tank, takes a pretty good suction on some Tiaras, but you have a macerator; so run out 3 miles, turn the valves to overboard discharge and pump out your tank. Frustrating to have to do that, but at least it works. If you know you are going off shore, full the tank to full with fresh water and pump all out when off shore. Helps clean things up. Change your charcoal filter regularly too, unless you like that odor!