When a dry sponge comes into contact with water, it will instantly absorb water blocks in all directions within a 7 block radius of the sponge. As soon as a dry sponge absorbs any amount of water, it is immediately converted into a wet sponge block.
Heating a wet sponge in a Furnace will turn it into a dry sponge. Placing an empty Bucket in the fuel slot of the furnace while smelting a wet sponge, will fill the bucket with the "evaporated" water (yielding one Water Bucket for each wet sponge). Wet sponges will also automatically dry themselves when placed in the Nether.
- Can be harvested from the ceiling of a specific room inside an Ocean Monument. The room contains approximately 30 sponges, and the sponges do not require a tool to gather
- Dropped by Elder Guardians when killed (the dropped sponge can be either wet or dry)