|2,908,400 per hour|
13,650 x Molten glass (4,354,350)
The Superglass Make lunar spell can instantly turn an inventory full of sand and soda ash into molten glass. Withdraw sand and soda ash from your bank, activate Superglass Make, and wait for the animation to finish before banking the resulting glass and repeating. On average 1.3 glass will be made for every sand-soda ash pair.
This can be done efficiently if you setup your camera right so that you have the mouse in the same place you click on the bank and withdraw quick load 1 or 2. One can cast it about 750 times an hour, with bank presets and activating the spell using a keybind on the action bar. Using Mouse keys, the number of casts per hour may rise to up to 914. See Superglass Make: Maximising speed for more details.
The small or large rune pouch can be used to store Astral runes, meaning you can convert 14 sets of sand and soda ash per cast instead of only 13, increasing the profit per hour by about 7%. The Elemental battlestaff supplies unlimited fire and air runes, further increasing profit.
It is strongly recommended to check the live prices on the Grand Exchange before making large investments in any method.
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