good pump, low volume

Of course I did not have any long-term experience with this product; so far it does its job well.
The volume is acceptable, but certainly not suitable for the bedroom.
Similar to the air pumps other manufacturers also raises the question, how do you get the air filter should be replaced regularly. There seems to be only the elaborate way to order the filter as a spare part from the manufacturer. Easy would certainly these filters settle the aerators of the respective manufacturer, offered in any pet shop.