09/17/2026
Another batch of tank treatment ready to go. This has been our go to for 8 years. We tried TSP in the early days and weren't impressed, especially by the cost. Then we had someone who had been traveling for a few years tell us this recipe and we really like it. 1/2 a box of Calgon and one 32 oz bottle of Pinesol general purpose cleaner combined in a gallon jug. Fill the rest of the way with with water and shake to dissolve the Calgon. This makes a concentrate. We add about a cup into the toilet bowl, fill the bowl with water and flush. We do this after every dump. We also add a small amount to our gray tanks after each dump. We tend to keep our gray tanks closed and dump them after we dump the black when we're not going to do a tank flush. Don't forget to shake well before each use. Each gallon costs less than $3 and lasts us several weeks.