Big bonemeal is an item that can be used to train Prayer at the Ectofuntus. To create the bonemeal, players must grind big bones on the top floor by dropping them in the hopper and turning the valve (giving 1 xp in the process). The player can then empty the bin to receive the bonemeal. The bonemeal will automatically be put in a pot, it is not required to bring your own.
Combined with a bucket of slime, it can be used to worship the Ectofuntus, giving 4 times the normal prayer xp, as well as 5 ecto-tokens. No pots or buckets are returned when doing so.
- ^ This table assumes that two burners are lit while using the gilded altar, and excludes the cost of clean marrentill.