What replacement ink bottles should I buy for the HP Smart Tank 790?
You should purchase HP GT53 Black bottles (approximately 4,000 pages) and HP GT52 Cyan, Magenta, or Yellow bottles (approximately 8,000 pages each). For more information about fill and yield, visit www.hp.com/go/learnaboutsupplies. (Page 2)
From the official HP Smart Tank 790 manual, page 2
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