The biggest downside with the tunze is the adhesive tabs that secure the controller to a vertical surface. They are almost guaranteed to peel off at some point, and when they do, they will fall on whatever is below them.
Mine fell in to the auto-top off bucket and promptly died. Thank goodness it was pure fresh water, so all I did was unscrew the casing and point a hair dryer at the circuit board until I was sure it was dry.
6 months later, the thing works like a bloody charm. I'll never run a tank without one.
I'd screw it to the wall next time though...
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