pH stands for power of Hydrogen; and is a measure of negative base 10 log of molar concentration of Hydrogen ions. pH scale ranges from 0 to 14; with pH's less then 7 being acidic and those above 7 being basic and pH 7 indicating neutral pH level.
The level of pH in a water body is important, as most organisms function (biological functions) within a narrow range of pH. Therefore it is important to ensure pH levels are within acceptable range for proper function of ecosystems. For examples low pH levels can lead to heavy metal ions to dissolve in water and making it toxic for some organisms.
Maintenance of pH level is not only important in water bodies, but also for that supplied for human consumption and use; high pH levels can results in depositions on the water supply pipes clogging them. In addition, high pH levels can make drinking water taste bitter and reduce the overall efficacy of disinfectants such as Chlorine, leading to more water borne diseases.
On the other hand low pH level can result in corrosion of water supply pipes.
