For me it's the air intake on my BK 180 mini.
Quote:
Originally Posted by Myka
Oh, the Tunze Osmolator is actually louder than anything else when it is topping up the water.
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I had that too - until I used a piece of styrofoam to float the motor so it doesn't vibrate against the bottom of the tank. And the additional advantage is that if I do hear it humming on the bottom, I know it's time to top up the ATO reservoir.