The document discusses cassava starch production in Colombia. It notes that production mainly occurs in small operations called "rallanderías" in the Cauca Department, where slurry settling occurs in channels. During strainer operation, the slurry concentration was typically between 0.1-6%, with discrete particle settling predominant. Flow in the channels varied from 0.82-1.44 L/s with laminar flow and over 150 minutes retention time. Particles over 10 μm were efficiently retained in the first 104m, but 6.7-8.8 μm particles were discharged, causing environmental issues.