Johnson Screens' NuWell 100 is a dry, pelletized acid that sinks in water for cleaning wells. It cleans calcium and magnesium carbonate scale, iron deposits and moderate biological growth. NuWell 100 contains an inhibitor to protect metal surfaces and a color indicator to allow visual pH monitoring during treatment. NSF-certified for potable water well use, the product can be poured in pellet form directly into the well, or it can be dissolved and pumped into the well as a liquid. Johnson Screens, Card No. 212