Leca Expanded Clay Pebbles Grow Media - Orchids &bull; Aquaponics &bull; Aquaculture &bull; Hydroponics- by Cz Garden Supply&reg; 2LBS of 100% natural expanded clay. Inert, pH-neutral, clean & decorative. For Orchids - Clay Pebbles porous structure provides excellent aeration and acts as a water reservoir. For Hydroponics - Ensures good root aeration and prevents rotting, excess acidity and soil pests. Fills approximately: twenty-four 2" pots, or eight 3" pots, or two 5" pots. 5 FREE Blue Micro Sprayers - a $5 Value FREE!