Organic Compressed Media CocoTek Bricks are three different types of compressed coconut coir. These high quality, low sodium, growing medium are an environmentally friendly alternative to sphagnum peat moss. When hydrated with water, CocoTek Bricks rapidly expand which saves you time and effort. Cocotek Bricks can be exclusively used by themselves, blended together or mixed with expanded clay pellets, perlite or topsoil.