Filtrexx BioWattles 9″x 25′ are engineered from a biodegradable cotton product that has the necessary flexibility, strength, and durability while meeting the flow through rate required by federal specifications. Biodegradable Cotton BioSoxx™ achieve the same performance as the photodegradable multi-filament Soxx™ that you have come to know and trust. Fill material will be 100% chopped agricultural straw weighing approximately 2.0 lbs.