Mother Earth? Growstone Chunky Growing Media is the perfect growing media for use in hydroponic growing systems as simple as manually irrigated containers or as advanced as automatically drip irrigated containers, Ebb-Flow systems and NFT tables. It replaces strip-mined materials like clay pebbles or stonewool, reducing environmental degradation. Mother Earth? Growstone Chunky Growing Media is designed to allow for rapid moisture absorption and enhanced drainage and oxygenation. 100% Recycled. 100% American made.