EarthTecEarthTec is sold in 2. 5 gallon containers. EarthTec is used liquid to control algae, bacteria, and pond weeds in irrigation reservoirs, ponds, and potable water supplies. EarthTec can be used for suppression of bacterial odors and toxic gasses. For algae control apply in the late spring or early summer when algae first appears. Water should be preferably above 60F. Several application points speeds up dispersal. Treatment of algae can result in