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There is a huge array of choices.
The best is the Thetford Campa-Chem, but it is formaldehyde based and cannot be used in CA and other states.
Also should not use formaldehyde based products if you are on a septic tank.
Other, more "green" choices range from less effective to ineffective.
Not sure if the 2012 Interstate has separate black water and gray water holding tanks.
If separate, always put a gallon of water back in the black tank with 4 ounces of Campa-Chem after a dumping and after you close the dump valve.
Always have water in the toilet bowl to keep tank smells from wafting into the coach.
No need for chemicals in the gray tank.
Hope this helps.
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Ken 2007Chevy 2500 HD Duramax/Allison NM Unit WBCCI #8654, Affiliate Four Corners Unit "Those Airstream photos on the internet that fuel your fantasies will always capture the gleam of aluminum, but rarely all the blemishes, and never the smell."
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