HabiStat Coir Block is a compressed block of burrowing substrate for species from humid environments. It is 100% natural, organic, biodegradable, non-toxic, non-abrasive, and comes from sustainable resources. HabiStat Coir Block wets quickly and holds water without draining. Instructions: place block into a tray or bucket and add 3 litres of warm water. Top up with more water as required and leave for 1 hr to allow it to expand fully. pH values 5.4 - 6.8.