Do your dosing containers have a vertical volume scale? If not print one up and stick on so if you do get a webcam the levels will be visible so you can see progress or lack of..Can you fit a webcam (one that has recording capabilities) under your sump and point it where the dosing lines are? You could check footage of when the doers are supposed to be dosing while you are away to hopefully give peace of mind.
Also if your more curious they do make rotating cameras that pan around