VeliGON may be metered into the flow and may be fed undiluted as long as in-line dilution is provided. Dilution to 1 percent as product is recommended to assure better contact of the coagulant with impurities in the water. Feed systems for undiluted material should be capable of handling 5,000-cps viscosity material. A Calgon SD, P-18, or MDS feed system is recommended by the manufacturer.
Addition of products should occur at a point sufficiently inside the intake pipe to prevent any release of VeliGON into the intake source (5 to 10 ft or 1.5 to 3 m for normal flow operations).
Addition should be made through a supply line placed inside the intake pipe or in some locations that will ensure that no contamination of public water occurs in the event of a break.
Feed exits must be equipped with a pressure check valve at the feed line exit to seal the feed line when intake flow stops.
Feed pumps must be designed to shut down when intake pumps stop. Planned shutdowns shall require feed pumps to be stopped 1/2 hr prior to shutdown.