More newbie questions - black tank flush system

your description of your tank flusher/sprayer confuses me. my systems have all been external to the RV. sprayer mounts on side of black tank and hose stays outside to hook up or are you talking about that tiny wash down the toilet sprayer that some RVs have?
re-reading your post leads me to believe that you don't have a black tank spraying system at all.
bumpy