You can only refill once or twice then you have to buy a new cartridge because they do wear out.
I my experience I am not sure its worth the bother to refill, its messy and I have refilled them several times successfully but I also destroyed a printer once after I refilled because the cartridge leaked.
I my experience I am not sure its worth the bother to refill, its messy and I have refilled them several times successfully but I also destroyed a printer once after I refilled because the cartridge leaked.