In printers refilling the ink is one of the process which often done by the people.In laser printers you have to replace the toner catridge or toners.But in inkjet printers you have to replace the ink catridge or the ink.Ink is mainly used to print the matter on the paper.So whenever you print a matter or photo or anything else some amount of ink will be used.Because of the consistent use the ink catridge becomes empty soon.The replacing process of ink does not cost much. http://www.cheaprefills.info