I've used something exactly like that a few times. I agree that the filter would be a good idea, but I've been lucky enough to get away without it. It seems to work well, although I just made venturi thing that I hook up to the end of my transfer tubing and swirl around while I'm running out of the brewpot so I use that instead now. I used to just let it run for 20-30 min while I was cleaning up and then pitched. I always had 3-4 hour starts and active fermentations using the pump, though. I used the acquarium airstones too. I'd just take one out, throw it in the Starsan bucket until I needed it, then throw it away after each use. I think they were 2/$1 at Walmart, so no worries there.