The CocoTek Coir line of Organic Growing Media consist of two types of loosefill CocoTek media and four different types of compressed coco coir. These high quality, low sodium, growing media are an environmentally friendly alternative to sphagnum peat moss. When hydrated with water, Cocotek Bricks and Blocks rapidly expand, which saves you time and effort. GH Cocotek growing media can be used exclusively by themselves, blended together or mixed with expanded clay pebbles, perlite or topsoil.