A coarse treatment system in which wastewater is trickled over a bed of stones or other material covered with bacteria that break down the organic waste and produce clean water. One of a family of organic compounds named as derivative of methane. THMs are generally by-products of chlorination of drinking water that contains organic material. Development or formation of small mounds of corrosion products on the inside of iron pipe. These tubercules roughen the inside of the pipe, increasing its resistance to water flow.
Arctic tundra is underlain by permafrost and is usually water saturated.
Haziness in air caused by the presence of particles and pollutants. A cloudy condition in water due to suspended silt or organic matter.