“…Chitosan, a polymer of acetylglucosamine, is an edible nontoxic flocculant that has proved effective with various microalgae (Nigam et al, 1980;Lavoie and de la Noue, 1983;Morales et al, 1985;Lubian, 1989). Chitosan is easily manufactured and requires low dosage rates (Richmond and Becker, 1986), but its flocculating power is reduced in salt water.…”