I have used about a gallon of generic black ink over the years in my Epson 600. Just make sure there are no air bubbles.

fp - Of course they are going to say it is do to the generic ink. The ink is where they make there money. The banding (horizontal lines) come from the heads being clogged. The "good" ink will clog just as easily as the generic if you don't clean the heads every once in a while.
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"Just Say No To Sovereign Nations!"