PLANT!T Horticultural Clay Pebbles are made from 100% natural clay, they are pH stable and offer excellent aeration and drainage. Due to their unique structure and large surface area, they offer the ideal environment to foster beneficial bacterial growth around the root zone, leading to healthier plants naturally. PLANT!T Clay Pebbles are unlike some other pebbles on the market as their non-uniform shape results in an increased surface area that leads to better aeration and greater water retention, they will not float once fully wet, and are pre-cleaned. PLANT!T Clay Pebbles are available in 10L and 45L bags. To find a Hydrofarm Authorized Retailer near you visit Hydrofarm.com.