A coco peat brick is also called a coir brick.  It is made from coconut husks leftover from the coconut industry so is 100% organic and a very good use of resources.  The husks and dust are dried and squashed into a brick making it very easy to transport.  It is used in propagating mixes and potting mixes because it is fantastic at holding moisture.

Buy a coco peat brick from a hardware or garden centre.  It’s quite cheap and very light weight.

When you want to use it, put the brick in a bucket and fill it with water.  In around 15 minutes, it will become re-hydrated and swell up to fill the bucket.  One brick will make around 7 litres of coco peat.