I have read that chlorine is bad for gaskets and seals so I don't use it. I use the softener, detergent, and a black tank chemical. I put the chemical in to help break down solids. The last thing I want is a problem with the black tank. I'm sure your dealer's service department feels the same way.
Bob and Joyce
2013 CC Silverback 29RL
2010 Ford F250 XL Crew Cab 6.4 liter diesel
ATU Local 788