Ok so how do you dispose of the carbon for power filters..or maybe any filters? I am still learning about filtration so excuse me for the maybe irrelavant information..but i got a Emperor 400 power filter..and i am trying to figute out if it is ok to dispose of it into the garbage or is there something special you do to it..lol. anyways im also gonna ask if you fill some of the gray cartridges up or all of them..like there are dividers and idk if it really is supposed to be filled all the way..