There may be a temporary service outage on our Digital Library (non-newspaper) pages on Wednesday, July 30th while we update the CONTENTdm production server from version 6.5 to version 6.8. This means that the Digital Collections may be temporarily unavailable on July 30th. We plan to have all services restored Thursday, July 31st. Thank you for your patience.
Coagulation is a positive-negative ion process. Plant managers add chemicals with a positive charge. Negatively charged bacteria and dirt join with the chemical to form a floc molecule. A series of motors turns the water so that the floc molecule becomes increasingly larger. Spotlights show the relative sizes of the enlarging molecules.