Noob Doser ?

[Typlus5]

Sorry if I'm missing something terribly obvious here...Do these (or other) dosers create their own siphon from the 2 part containers or do I need a pump to apply pressure?

http://www.bulkreefsupply.com/Auto-...ium=email&mc_cid=7536fcbbfe&mc_eid=53f9c14d4c

 

[GlassReef]

They will "self prime".