I know this might be an out of box idea...but Ive had my bubble wall & pump on a 7-day timer for about 10 years. Be sure to use a anti-flowback valve (about $3). It comes on at 8am and goes off at 9pm. That way it doesnt bug me at night when I sleep, because although the pump isnt loud the humming will keep me awake (light sleeper).
So yeah, try a timer.