A lifetime of living on a boat has taught us that two separate toilet systems, one for each partner eliminates a lot of odors. He uses a Thetford Casette style portapotty, (sometimes referred to as bucket and chuck it) and I use the on board toilet with the holding tank. We both use "blue" treatment. By keeping to your own toilet, the bacteria in your guts doesn't mix, and this greatly keeps down the stink factor. Also, we have a metal foot pedal type waste can for all our toilet tissue, using small trashbags, which we empty frequently in appropriate dumpsters. I don't trust any paper in my holding tank. Also, a deoderizing Lysol antibacterial spray around inside the toilet after each use makes it more pleasant.