Rice Hull directly harvested from Camarines Sur Rice Mill. 500grams is 3-4 liters. Rice hulls provide a dense source of carbon which, when composted, can increase the water and nutrient holding capacity of soil, improve soil aggregation, porosity, infiltration, and many other key beneficial soil physical characteristics. Rice Hull will not be packed individually, we'll use bigger plastic or a sack for heavier orders to lessen the use of plastic.