Konoo stands by the Saltpetre spawn in Hosidius, on the Great Kourend. He offers some dialogue about what saltpetre is used for. He will provide players with a free spade, should they not have one in their inventory.
Konoo's name likely comes from KNO3, which is the chemical abbreviation for saltpetre, or potassium nitrate.
He is also the person to talk to for the easy clue scroll "Salty Peter".