Before I got a trailer with a built in back-flush, I used to drain the black tank, then fill up 2 or 3 buckets of water and dump them down the toilet fast to dislodge "stuff". I bought one of those clear elbows to see when the water would run clear, and I noticed that everytime I threw down a bucket, I would always seem to dislodge "chunks". Even now, with the back flush system, I still use buckets. It just seems to take less of them to make it clear.
There are some really bad dump stations out there that are really unlevel (ever been to the Shell north of Cochrane?) so dumping buckets will really help that.
Also, to answer your question, if you are running water out of your won fresh tank and your pump is on, it should keep pumping until your hot water tank is full. There's also a pressure relief valve on your hot water tank, so make sure you keep it ope while filling or air gets trapped at the top and the pump won't fill it all the way. When I go camping, I fill up my fresh water at the potable water tap at the campground's dump station. It goes faster if you hook up to the city water connection on your trailer first and let that fill your hot water tank, then switch the hose over to fill your fresh tank.
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