This is called the G0 phase.
Groundwater is the water found beneath the earth's surface in spaces in soil, in cracks and rocks. These spaces are called aquifers. Groundwater serves many purposes where most of it is used in irrigation purposes. In the year 2005, 68 percent, most of the groundwater withdrawals, were used for irrigation, 19 percent was for public supply and the remaining 13 percent was used for other applications in industries.
3.4. The closer you get to zero the more acidic a substance is.
