Cay pellets also go by clay balls and beads. They’re produced by heating clay up to 2000°F (1200°C), making the gases inside expand to look like a sponge or honeycomb.
The bubbles in the pebbles are perfect to absorb water and air. The thin clay walls are porous and let water seep in and out. The consequence? Expanded clay pellets make ideal air moisturizers thanks to their structure and materials.
Water will evaporate from the surface of the clay balls and enter the air around it. Thanks to capillarity, water deeper inside the clay ball will seep to the surface for evaporation to continue.
Clay Pellets are often used as an additive in soil mixes to ensure a proper grow without excess moisture.