if you don't replace the carbon often i wouldn't replace it, or i would be careful with removing it because your bacteria has probably colonized it, you might have a mini cycle removing it.
never replace the biomax.
simply fill a 5 gallon bucket with tank water, put your carbon and biomax and other bio media in the bucket with the tank water, then rinse and scrub the rest of the filter parts as much as you want. then put it back together