Make sure the 1" Plug is screwed into the empty section where no Clarisea will be used.
Install the included filter sock plate into the empty space. No filter sock is needed unless you want to have one in there.
It can be run with no sock in the holder if you choose as well, but you may get some trickle noise. Having a filter sock in the empty chamber can help to reduce noise if your flow is more than the Clarisea can handle.
You are now ready to turn on your return pump on your system!