Refilled cartridges are those whose new ink or toner has been refilled by a cartridge refilling shop or by the cartridge owner himself with the aid of a cartridge refilling kit. Although refill kits are more economical than getting the cartridges refilled by a cartridge company, the quality of the kit’s ink or toner is usually not of a premium quality. The other problems of getting the cartridges refilled at home is being unable to change any worn out part of the cartridge, contamination risk of the new ink with the residual old ink, and the chances of air bubble being pushed into the cartridge while refilling it. It is better to get them professionally refilled by a reputed cartridge refilling company.