Soon I will need to empty my waste cartridge for our BN-20, from searching around it seems that I could reuse the same assembly by going through some steps. My question is on ink disposal, I know I can't just throw it away, but our local sales rep has said that it can be disposed by normal means if it is no longer in a liquid state. For example if I were to use Oil dry or Kitty litter to dry up the ink. I am not necessarily looking to cut corners, I want to be responsible with my ink disposal.