1 Buy = 4 Hydrofarm PLANT!T Clay Pebble Bags. PLANT!T Hydroponic Clay Pebbles. are made from 100% natural clay. They are clean, pH stable, and offer great aeration and drainage in hydroponics, especially in flood and drain, deep water culture, and drip feed systems. Due to their unique structure and ability to cover a large surface area, they offer the ideal environment to foster beneficial bacterial growth around the root zone, leading to naturally healthier plants. When used in aeration of growing media, mix Hydroponic Clay Pebbles into your coco coir or soil at a rate 4 parts clay to 7 parts soil to loosen up the structure, leading to better root development. VMInnovations is an authorized Hydrofarm dealer that sells new, warranted products.