I have no experience with this, but I wonder if the residue from the detergent would/could have an effect on the tank in so far as the good bacteria needed to disolve things? Ask Keystone about this, hopefully they will work with you eventually... No matter how many check lists you have, there is always something that sneaks by. I hope it works out, would be a pain if everytime you wanted to do a load of laundry you had to open the black tank, or even worse yet, forget to open it.
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