Being sick and tired of buying cartriges for my HP Photosmart printer, only to have them run out of ink in a week or less, I decided to try a different route. So I sprang for one of these CISS (Continuous Ink Supply Systems). It comes with a set of cartridges connected to a set of rather thin silicone tubes that connects to an ink reservoir. As ink starts to run low , by looking at the clearly visible ink levels in the reservoirs you simply add ink to the reservoirs as they run low. The hardest part of installing the thing was in carefully removing the smart chips from the original cartridges and attaching them to the CISS ink cartridges, as the chips are small, delicate, and easily damaged and the only way to get new ones is to buy new cartridges. In any event it worked, I transferred them without damage, installed them in the printer, connected up the reservoirs, attached the air filters and, viola'... it works. The second hardest part was routing the tubing so that it doesn't snag the printer carriage. But once I got that done right it works like a champ. Print quality is excellent. If this thing lasts and turns out to be problem free it means filling the ink is no more bother than topping off the reservoirs once every few months.