no bag - the way to go, just use an old ice-cream bucket for each of the media types
just rinse pads in tank water, they should last a year or two (white one), longer for the thick one
media removal should just be once or twice per year with a simplified "backwashing" in between - procedure is as above, but you gently turn the bottom pipe down and open the valve so that water will drain out - just pour some treated (or not too dirty tank) water into the top and agitate a little as it drains - repeat a couple of times - will get the "big chunks" out and improve flow
once the pads are a bit compressed and there's zero tension between the spacer and the pump assembly, add a nylon pot scrubber or three to the bottom of the can before putting the ceramic tubes back in - mechanical filtration tends to be more efficient if the media is not free to get tossed around inside the can
I just rinsed and repacked my 2215 last night - it *really* needed it, HUGE improvement in flow - I'm hoping that's what I was missing in my BBA battle