The osmolator pumps about 1 pint pper minute if I had to guess. Imagine a stream that shoots about 4" from a hose the size of airline tubing. It can handle up to 9ft of head. The primary sensor uses infared, a secondary safety switch is present if the optical sensor fails. The circuitry has a logic component where it uses the data available to it to make some assumptions. It runs a few seconds after registering full and waits a few seconds after sensing no water to turn on, this saves the relay and pump from excessive wear incase it is just a wave or surface disturbance. The system also will sound an alarm if it gets unusual feedback, like float switch is up but optic sensor is indicating no water is present. The other feature is, if a fill isn't registered within 10 minutes it figures either your tank is leaking or your bucket is empty and shuts off sounding an alarm. You do have some settings for alarm function and can disable it. There is no way to time it. It is so sensitive that very little water will be dispensed at once, you could safely dose kalk all day as it is unlikely more than a cup of solution would go in at once- the sump literally has to just drop 1mm to turn it on.