Please be aware that aquarium pumps, filters, skimmers and other electrical goods emit noise during normal operation that you may consider to be excessive. You should be aware that manufacturers wording indicating noise levels are relative only and do not necessarily give indications of measured decibel levels. Return of good under these circumstances requires the agreement of the manufacturer and where goods returned are deemed to be in good working order by the manufacturer we are unable to offer a refund and may charge return postage