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Amazon.com : Liqui-Dirt LiquiDirt Leca Lightweight Expanded Clay Pebble Kit 1lbs - Includes Trial Liqui-Dirt Concentrate Gel Packet for Complete Plant Nutrition - Great for for Soil Additive Hydroponics and Aquaponics :
Amazon.com : Harris LECA Expanded Clay Pebbles for Plants, 2.5lb for Indoor, Outdoor and Hydroponic Growing Brown : Patio, Lawn & Garden