I shut it off and use the on board pump for night time toilet use. RV's are so cheesy that you never know when they will blow a line off or start leaking around a fitting. I also shut the on board pump off most of the time and always when leaving. One good thing about using the on board pump is that it is also an early indicator of small leaks. If it cycles on every now and then it could be a non threatening internal pump leak but it can also be a small leak. Never ignore it.