It can be washed and reused for a long time without changing it. The fine pad is the least durable, but the blue pad, the rings and the cocoa puffs hold up pretty well to repeated washings. I usually do mine every six months or whenever there's a noticeable decrease in flow. For minor cleanings, I just take the motor off, put it in the tub, and just backflush it with a couple buckets of water. For more thorough cleanings, I put the loose media in a kitchen strainer and rinse them in a bucket, and hose off the pads.