I've had this tank for 2 years and I haven't changed the filter, always gave it a good rinse in dirty tank water and replaced, but now there is nothing left to rinse! It's safe to say there is no more "filter" left on this cartridge, so I take it I should buy a new one and put whatever little bits of cloth and such that are left off the old one onto the new one in hopes of saving some of the BB? Would this work out okay? Just thinking about changing it makes me nervous, I don't want to deal with a mini cycle..