Simply attached to filtration inlet hose.
The Sera Prefix is a unique media reactor from Sera which is both practical and affordable. Looking more or less like a motorless canister filter, the Sera Prefix is specially designed to add media filtration to a wide range of aquarium environments.
The plastic molded design includes a twist on/off lid and quick disconnect inlet and outlet barbs. Inside the Sera Prefix holds nearly half a gallon of media or 1.6 liters and this volume can be be split into two different medias using the two separate media baskets.
While it doesn’t have any active mixing like you would get with a biopellet reactor, this is more ideal for activated carbon, GFO & mechanical filtration media.
The filter can be connected to a pump or an external filter by means of a sera hose 16/22 mm. Connecting several PrefiX filter in series is also possible.