Complex sentence: It is also used in fresh water treatment for raising the pH of the water so that the pipes won't corrode where the base water is acidic because it's self regulating and does not raise the pH too much.
Split into simpler sentences: It is also used in fresh water treatment for raising the pH of the water so that the pipes won't corrode where the base water is acidic. The reason is that it's self regulating and does not raise the pH too much.