As I indicated in an earlier forum, I have a leak in my holding tank pump out fitting. I have been unable to completely empty the tank with the macerator it is not properly installed yet which is a project to do yet. There was about 7-8 gallons still in the tank. We do not have a pump-out station close and in desperation I decided to try my 16 gallon wet vac I bought from Home Depot a few years ago. I adapted a hose to it that fit the pump out fitting on deck and the shop vac totally cleaned the tank out. After disposing of the waste in the bathroom, I sanitized the shop vac and hose. The shop vac worked great!