Despite popular belief, municipal water treatment does not remove all particles from a city’s drinking water. Green Water Technologies explains what treatment does and does not do in the following brief Q&A.
Q: What are coagulation and flocculation?
Green Water Technologies: These are often the first stages of water treatment and involve adding chemicals that provide a positive charge to water and a negative charge to dirt and other undesirable particles. The dirt particles then bind together and form larger groups known as floc.
Q: How is water filtered at a treatment center?
Green Water Technologies: Since floc is heavier than water, it settles at the bottom of a large tank; this is the sedimentation process. This sediment is left in the tank while the lighter, cleaner water is pumped through a series of filters made of charcoal, sand, and gravel to remove other, smaller particles.