Which Way?

[stella!]

Hey this is a realy stupid question but i just got my new diffuser from aquaessentials and i just wonderd which way it should around it should be put?
This is a link to the diffuser:
http/www.aquaessentials.co.uk/index.php?...roducts_id=1235

 

[George Farmer]

Open end facing upwards to the surface.

 

[stella!]

ok thanks but that leaves quite alot of tubing in the water... owell