Sorry but I must be anal, I rinse everything every time, even between jobs. It certainly cant hurt and my stuff last's a long time, I just throw it in a bucket of water and open the ball valve. The same goes for my roof pump, I never leave it charged with chemical. Have u gotten strong mix on your hand where it turns white? and u go running to rinse it off? Imagine that sitting in your pump day after day. Nothing is cheap, take an extra minute and rinse it out. Carry On !!