Suspended matter

Suspended matter is made up of fine particles. Some are present naturally in river water, such as plankton, fine plant debris and minerals, while others stem from human activity (organic and inorganic matter). Suspended matter can make water more turbid, which has a negative impact on river and stream biology. Source: http://www.total.com/en/corporate-social-respons2000ibility/special-reports/conserving-water/focus-on-freshwater/contaminants_freshwater_7740.htm