Charging water orbs
|Staff of water|
Dusty key (if under 70 )
|Inputs (592,725)||Outputs (3,050,775)|
525 × Unpowered orb (104,475)
1,575 × Cosmic rune (488,250)
525 × Water orb (3,050,775)
Water orbs are worth 5,811 coins, and are created by casting Charge Water Orb on unpowered orbs at the Water Obelisk. With an equipped water staff, this requires 3 cosmic runes per cast (or 930 coins). Using a ring of duelling to teleport to Castle Wars (or the Tokkul-zo) for banking, you can charge 27 orbs per trip (one inventory slot is needed for the cosmic runes, unless you use a large rune pouch), resulting in a profit of 126,414 coins per trip (131,096 if using large rune pouch).
The Water Obelisk is located on an island in Catherby only accessible via the Taverley dungeon. Using the map on the right as a guide through the dungeon, the round trip to the obelisk, counting banking, takes approximately 185 seconds using the 80 agility shortcut, 205 seconds using the 70 agility shortcut, or 325 seconds without any shortcuts. If you have a Dungeoneering Cape you can use the teleport option to teleport to the Taverley Hellhound Dungeon which puts you within clickable range of the ladder to the Water Obelisk, this will considerably reduce travel time.
Assuming the unpowered orbs and cosmic runes are purchased, you can make 525 water orbs an hour using the level 80 agility shortcut (2,458,050), 475 water orbs using the level 70 agility shortcut (2,223,950), and 300 water orbs using no shortcuts (1,404,600).