Bio Chaff is an IndustrialCraft 2 (IC2) organic intermediate produced by macerating biological matter in an IC2 Macerator on Minecraft 1.7.10. Bio Chaff converts saplings, weeds, plantballs, leaves and similar low-value organic items into a stackable resource that feeds the IC2 biofuel pipeline. Players use Bio Chaff as a feedstock on the path toward Biomass, Biogas and ultimately Biofuel, IC2's renewable energy source that powers EU-based generators and machines. Bio Chaff turns surplus farm output and tree-farm scraps into a useful industrial ingredient instead of compost. Bio Chaff is not naturally generated anywhere in the world: every unit comes from the Macerator, which means a stable supply requires a working tree farm, crop farm or weed source plus a powered Macerator drawing EU from an IC2 generator. Bio Chaff also appears in some IC2 Fertilizer recipes, giving the item a secondary role in agricultural automation. Because Bio Chaff stacks like any normal item, large bio-energy setups buffer it in IC2 chests or modded storage before feeding it into the next stage. For modded survival on 1.7.10, Bio Chaff is the practical bridge between renewable farming and IC2's electrical grid.