Water beads are little balls that expand when submerged in water, as is common knowledge. If you have used them and want to dispose of them, then hydration is the common procedure to dry them and store them for use next time. If you need to dispose of them completely, spread them in an outdoor garden. These beads are water-retentive. These don't hurt the environment or agriculture. All of these are biodegradable and free from any dangerous material.