Blue Dawn & "Piranha" / a great holding tank idea


New Member
We've found that the best way to keep both holding tanks in great shape and odor free is to every two to three months flush both tanks with a mixture of blue Dawn dishwashing solution (it has no anti-bacterial ingredients in it and therefore doesn't kill off the bacteria in the tanks. Then each time you dump either tank, put a capful or two of "Piranha" holding tank waste digester in each tank. This stuff even removes the soap scum & sour smell from grey water! It has a cinnamon scent and is all natural with no formandehyde. We get it from