A single 650g compressed coco coir brick — a low-cost way to try coco coir substrate or top up an existing bulk mix without buying in bulk. Made from coconut fibre, heat-treated during manufacturing, but we still recommend sterilising or pasteurising before use for best results.
 
To hydrate: add roughly 2.3 litres of water to each brick to reach field capacity. One brick expands to fill a standard grow bag or small monotub.