In this video, Scott Nicholson compares five different methods for dewatering clay that's already been used and needs to be recycled and reclaimed so it can be used again. The methods are a plaster bat made from pottery plaster, a Hardiebacker cement board, hanging a pillowcase, terra cotta flower pot, and bedsheet on a grate.
Spoiler: The plaster bat is the best.
Guide to Making your own Plaster Bat: https://youtu.be/ZciM2V6dudQ