If you're going to do something like this keep it simple. It's not hard to set something up where all you have to do is add a consistent amount of salt on a weekly bases and monitor salinity on a monthly bases. If you can't do that then I'm not sure what to say, after all you still gotta clean the glass right?
If you get into complicated systems with multiple pumps, solenoid valves, float switches, and timers or even hoppers you're not only introducing multiple sources of error but multiple sources of failure which is something you want to avoid.
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