[bharada]

All the DIY cannisters I've seen online have been in the Rainbow vein with an external pump pushing water through the cannister. For this I would guess any reputable pump will do. You might try browsing the reef boards to see what holds up well for them.

 

[bharada]

Looks like it has a 1/2" MPT fitting for the intake so you'd need to buy a suitable hose barb to screw into it. I've never used one personally so I couldn't tell you if it's quiet or not.

 

[bharada]

Well, the rated gph is probably without any head pressure so once you get it connected to your cannister and plumbed up to your tank's height it may be considerably less. Also, you could always increase the size of your return pipe/spraybar so that the flow rate is disperesed over a larger area so it doesn't create a lot of current.