That sounds about right depending on head pressure, you could reduce it by pumping to the main tank instead of the sump but typically about 1 cup for nano speed and 1 pint for medium speed. You could also add a drip irrigation valve to the hose end to further restrict the flow. Such frequent power failures are outside the operating conditions we designed around. If this is a common issue, the Osmolator does not use much power and a very small UPS could also prevent this.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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