Easily enough, you just pull it out and put the new one in. They seem to get greasy on the bottom and accumulate "stuff" and after a couple of years of scrubbing the bottom and putting them back in, they eventually don't seem to do the job as well. So I just replace them.
No tools needed
By the way, I love your service! Ordered on a Friday, arrived on Saturday via FedEx home. What more could I ask!