Sand pits are mostly used in glassblowing to train Crafting skill. Sand pits are located in Entrana, Yanille, Rellekka and in Zanaris.
Molten glass that can be blown with Glassblowing pipe is made by using Soda ash and a bucket of sand with a Furnace. Buckets of sand can be obtained simply by using an empty bucket with sand pit. Soda ash can be obtained by burning Seaweed on a Range or a fire.
If the player has completed The Hand in the Sand Quest then the player can get Bert to deliver 84 buckets of sand directly to the player's bank account daily.
In the Enlightened Journey quest the player needs a sandbag. It can be obtained by using a sack with a sandpit.