Mickeyfan0805 wrote:
The label next to the inlet for our black tank flush says that the drain should always be open for flushing. Why is this? Is this really a concern, or is this just there to make sure somebody doesn't leave them closed and end up flooding their camper? I originally thought I could use this same inlet, after flushing, to add some water into the tank, but this tells me I shouldn't.
Thoughts?
My opinion is it is a two fold issue. One being the one you mentioned about flooding and the other is to prevent a buildup of pressure in the tank. Theoretically if the vent pipe would get plugged with refuse it would be possible to over pressurize the tank until it burst. Whether this could actually happen or not I don't know and I do NOT want to find out. However what I do is pull the black tank valve and then turn on the flusher water. I let the flusher work for about 10 minutes and then I close the valve and let the flusher water run for 5 more minutes and then open the valve again. This helps to get the residue out of the bottom of the tank. I have not had an issue doing it this way. My guess is as long as you don't let it run for an extended period of time you will probably be Ok. I am assuming that you have a 40 gallon black tank. If not you may have to adjust some of my comments to your situation. I do not use the flusher to add water to my tank. My toilet will hold about a gallon of water when I fill it to the water outlet. I do this a couple of times, putting my chemicals in between fills, and call it good for another week. YMMV
