I spoke to my wife about this, and she said it's not loud enough to continue to worry about it. However, it is annoying me. I would like to put it in the garage to see if it's any better. The only thing is I have 3 of these that I plan on using. I'm really hoping they are not all this loud. I was even thinking of putting it in the attic but here in Texas, it can get hot up there. I'm sure you have the same problem in Australia. If I can't get the noise down, I will have to come up with something else. I really like the idea of a continuous water change. I think it will be less impactful on the corals. Not to mention the water reservoir is in the garage so due to the heat in the summer I would not be able to easily do a large water change.Can you put the dos in your garage? Or do the water changes at a time of day the noise won't matter? It would save the expense of a hole new dosing pump.