ZipperHead, I'm not familiar with the Sewer Solution so can't help you there. There are two ways to get water into your black tank. One is the flush, by using the flush located just below the city water fixture. The other way is to flush the toilet using water from the fresh tank. The first way should be all you need. The other issue is flushing your grey tank. Again running you faucets from the fresh water take will take care of that. Hope this helps.
Me, Mrs., and Maggie
2015 Precept 31 UL
2015 Equinox, Blue Ox Avanta LX