You only need it if pumping water from the on-board fresh water tank. If you have the city water connected by hose you don’t use the pump.
If you are pumping from the tank you can turn it on and leave it on (when trailer is in use). It has a pressure sensor and will cycle as needed on its own.
Just in case you’re not familiar with the sewage side of things......if you have full sewage hookups do not leave the valves open. Keep them closed until tanks are close to full, then drain. Two reasons; you won’t get sewer gas coming back into the trailer, and the tanks need liquid in them to keep the solids soft and moving. No fluid in the tanks and you will get a Pooh and paper pyramid that is hard to flush out.
Where yo need to be careful is that your tenants know when and how to empty the tanks. If they overflow you will have a serious and smelly mess inside.
