The Osmolator Nano was specifically designed as an economical top off for small tanks. As a safety it has a time limit for how long the pump can run and the pump is throttled to its lowest speed (7V of power). This time delay and low pump speed mean that even at the longest 3 minute delay, no more than about 2.5 liters can be added before the unit shuts down and has to be reset. For a tank larger than 200l it simply will not work. The full size 3155 Osmolator can add up to about 12l as it as a 10 minute delay and the pump speed can be adjusted so it gets from 7-11V.
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