It depends on how cruddy the tank really is. If you don't clean the tanks regularly "Happy Camper" probably is the best for deep cleaning and it doesn't destroy septic tanks. For occasional cleaning, any liquid laundry detergent will remove the scum. Just before you leave the campground dump and add about five gallons of water and a cup of detergent in both tanks the tanks will be clean when you get to the next campground. It doesn't hurt to leave the solution in the tanks for several weeks in between trips.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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