That's how I do mine. They have a screen on them, right? One screen is fine for little seeds like mustard and alfalfa, one is medium for seeds like radish seeds and one is coarse, for things like mung beans and such. Right now I have them soaking. They'll soak for a while...about 6 hours then I'll rinse them right through the screen and invert them, screen down and slightly tilted so they drain. I do that a couple of times a day and that's it! After a few days, sprouts! Take them out, rinse them real good, stick 'em in a baggie and start over!
I like bean sprouts in cooked dishes, but there isn't anything as good as sprouts on a sandwich...lettuce is wimpy in comparison!
The jar came with the different screens? Or it was a kit with different screens to use with a standard jar? Maybe I should look for one of those, too!