If you are running the scrubber via the Rio pump, please note that the pump came with a set of assorted attachments. One of them is a hose barb adapters, meant to be attached to the outlet of the pump so that a 3/4" ID hose can be used. DO NOT push the hose directly on to the pump outlet and zip-tie it - this is not a strong connection, and the pump can force the connection to pop off.