Tunze Osmolator

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I have to clean my optical sensor about every six months. Once or twice the unit temporarily failed on me due to buildup on the optical sensor and a cleaning with vinegar water got it working again.

I am on my 3rd osmolator. One was destroyed by water damage, the 2nd the optical head went after a few years. These things seem pricey and not as robust as some of the other auto-topoff choices.

The osmolators work very well to detect tiny changes in the water level eg. if I remove 30 or 40 mL of water from my aquarium then my osmolator will sense the difference and kick in. However on another tank I have an Auto-Topoff dot com float valve based topoff system and while it is not as accurate as the Osmolator, it does the job well enough.