Holding tanks are gross. There is just no getting around it. Humans, like all other living creatures, produce excrement. This is a fact of life with which we must all deal. On land it’s a little easier. Most of us have bathrooms with plumbing that sends our waste to places where we don’t have to think about it anymore. On a boat, it goes into a holding tank. This is something much like a septic tank. Except it’s not buried under the ground outside of your home. No, no…  In a boat, it’s likely hanging out in a compartment directly under your bed. Awesome. On our little 26 ft yacht, the set up was…