You can see it with a spray bar, but possibly even more so with a diffusor. It is pretty obious though if the flow is reduced. If you are packing it too densely, the filter can clog up fairly quickly. With using filter floss in a canister there is some skill involved in packing it just right. For the 2260 on my 125G and the 2217 on my 75G, 10 pound are going to last many years. I have bought it in 16oz (1 pound) bags from Walmart, but last time I stocked up Amazon had the best deal at $45.20 for the 10 pound box. I have used filter floss dedicated for aquarium purposes bought at the LFS and online retailers such as Big Al's Online, but my favorite material is Fairfield Poly-Fil ® Premium Polyester Fiber. I have tried other media time and time again, but I have never found anything that works as well as filter floss and is anywhere near as cheap.
EHEIM 2260 FACE PLATE SERIES
I have been using it in Eheim classic series filters since 1977 when I was at the tender age of 10, and am currently running it in the 2260 on this 125G as well as a 2217 on my 75G Geophagus setup. I find it's cheap and does an excellent job for both, mechanical and biological filtration. I use filter floss as media - and ONLY filter floss. I am sure they are good, but IMHO they are way overpriced.
I am a great fan of Eheim filters, but I don't use their media. If you follow this procedure, you will find priming Eheim classic series filters a breeze, and you can save hundreds of dollars on what a similar filter with self priming feature would cost. On the rare occasion that it does not, you simply have to disconnect the double-tap-quick-release at the filter outlet, and let some more water run into your bucket until there is only water in the filter and no air. In 99 cases out of 100 all air will have come out of the filter this way, and it will start without a hitch.
Open the return line and plug in the filter. Unplug the filter, close the tap on the filter outlet, and connect the filter to the return pipe via the corresponding double-tap-quick-release at the upper end of the filter. I will even plug in the filter shortly to remove air from the pump around the impeller. 
You want water to run clearly through the filter into the bucket without bubbles.
Wait until the filter has filled all the way with water, maybe tilting it a little at the end to expel all the air in the filter. If not, you need to give the return pipe a quick suck with your mouth to start the siphon. If there was still water in the filter intake line from the tank down to the double-tap-quick-release near the filter intake, the siphon should start automatically filling the filter with water. Do not connect the filter to the return pipe to the tank, but hold hose that's connected to the outlet of the filter over an empty bucket and open that tap. Connect the filter to it's intake via the corresponding double-tap-quick-release on the lower end of the filter, and open both of the taps on the quick-release. Put all the media back in the filter and close it up. Anyhow, here is how I start up my Eheim canister series filters after maintenance: While we are at it, you also want to put a double-tap-quick-release in the intake pipe of your filter, so you can remove the filter easily from the tank for maintenance. If you are using a a Hydor external thermal heater, like I am doing, the quick-release goes between the filter and the heater. Expelling the air is very easy to do if you are using Eheim's double-tap-quick-release in the return pipe from your filter to the pump. The pump cannot expel this air by itself, so you have to get it out, or the pump is stuck. The problem with these filters not starting up after a service is invariably air in the pump-head. Some people claim Eheim classic series filters are hard to prime, but I have never found that myself. Today I am running a 2217 on a 75G and this 2260. I bought my first 2213 in 1977 when I was 10 years old. I have had Eheim classic series filter run on tanks for 20 years and more without a hitch. In my humble opinion there simply is no better filter money can buy! They are super quiet, very efficient, and they last forever. That means they lack any modern gizmos such as self priming and so on. The Eheim classic series of filters has been around virtually unchanged since the 1970s. Now I finally got one, and the thing is all I ever dreamed about! I've been drooling over the 2260 ever since I was a kid. The tank is filtered by an Eheim 2260 canister filter with Eheim diffusor.
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