Boca Hydro Expanded Clay Pebbles

100% Natural clay PH Stable Strong expanded structure Great aeration and drainage Free draining, does not hold water. Increase oxygen levels to root zone. Approved for Flood and drain, DWC ( Deep water culture ) Aquaponics, Drip feed systems, Container gardening. Can be mixed into coco coir or other soilless mixes to add aeration. Top dressing for pots and containers to prevent evaporation. Large surface area can host large amounts of beneficial bacteria. Directions: Rinse thoroughly before use in strainer, pebbles will grind during shipment producing dust which clog any system.