The Epson ET-2750’s supertank system is excellent. Unlike typical inkjet printers that have removable cartridges you replace when empty, this printer has four high-capacity ink tanks you refill yourself. You can print an extremely high number of copies before needing to refill the tanks, and even then, you should still have some ink left over in the bottle.
While it’s technically possible to fill the supertank with any third-party ink, we didn’t try it and don’t recommend doing so as low-quality ink could damage the print heads and, unlike regular cartridges, can’t be removed if there’s a problem.