So for me the Resetter works with new and old cartridges! and the Epson Stylus Office BX525WD So I can when the cartridges still over 10 percent, these make full again. Below 10 percent is not that! If they are geresettet the printer performs an ink filling through (which he does not have at an already used cartridge yes) and thus consumes ink. Nevertheless, you can probably get even a few pages more from Epson cartridges or (like me) use the printer only for B / W copies and let the colors "unfilled".