I have the Seaclone 100 and I have been running it on a timer since I installed it several months ago. I turn it on at Midnight and off at about 5pm. This way when we are relaxing in the same room at night we won't hear the bubbling noise. The PH
is a maxi-jet and I have not had any problems stopping and starting it. In fact, even if it wasn't on a timer I would probably be stopping it at least once a day for feedings.
This routine has been working well for me and can recommend it if noise is an issue.