I have a Whisper 30-60, so I just clean out one half of the filter (it has two compartments that each hold one floss bag and one sponge) weekly when I do my gravel vacs and water changes. Yours is probably the single one, so I guess you could cut your sponge in half or not use the floss bag and buy another sponge, and then you could rinse out one sponge whenever you do your maintenance, your other sponge will stay there until the next maintenance, and then you'll clean that one.
I did an experiment once (I always clean my filter media under tap water, just quicker and all) and wondered what would happen if I just cleaned out all the filter media under the tap. Well, turns out nothing bad happened. Checked the water parameters later and everything was in the up and up. I think what happened was that bacteria from other places in my tank quickly re-colonized my filter media. I don't suggest you do this, but just something interesting to share.