Urban Worm Coco Coir is a proven, eco-friendly worm bedding and soil amendment made from coconut husks.  It has been rinsed to remove salt content and features a near neutral pH.
 
Each 1.4-lb brick absorbs nearly a gallon of water and expands to over 2.5 gallons of a loose, fluffy, substrate you can use in your worm bin, garden, or custom soils.