best auto top off?

I like the Tunze osmolator. It uses a optical sensor, so the it is sensitive to small changes. It pumps small amounts at a time rather than pumping larger amounts only a couple times a day. It also has a safety float in case the optical sensor fails.
 
Whats that other company that makes all those versions... neptune systems or something like that? Cant remember the name, but really nice looking stuff it looks like. Otherwise, the Tunze is the top dog.
 
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