It is too late to tell you now, but you should have bought a refill kit with a deprogrammer for the chip. They normally come with an empty tank. You peel the chip from the Epson cartridge and deprogram it. Then put it in the slot in the new cartridge and fill it. From then on you slide the chip out and reprogram it every time you refill. The kits with the empty cartridges and deprogrammers are reasonably inexpensive.

I think what ttodd is referring to is a nuisance on the HPs that give an empty signal when it calculates the tank is empty regardless of whether you refill it. The Epson is completely different in that Epson designed them to keep the printer from working when the chip calculates the tank is empty. The only workaround I have seen is to deprogram the chip or buy replacement cartridges with a chip in them. Epson specifically designed it to keep you from refilling so you will have to buy Epson cartridges since they probably make more money selling one refill set of tanks than from selling an entire printer.