What should you do if you discover green water in a pool?

When you discover green water in a pool, it typically indicates the presence of algae and potentially other contaminants. In this situation, it is essential to address the issue to ensure the pool is safe and enjoyable for use. Shocking the pool with chlorine is a crucial first step, as it raises the chlorine levels significantly, which helps to kill algae and other bacteria present in the water.

Additionally, treating the pool with an algaecide specifically targets the algae that has already begun to grow, helping to prevent future outbreaks and enhance the overall sanitation of the pool. This dual approach—shocking the pool and using algaecide—works effectively to restore clear water. It not only tackles the existing problem but also provides a protective measure against further algae growth.

Other options will not effectively resolve the situation. Leaving the pool as is allows algae to thrive, and adding more water would dilute the existing contaminants without addressing the underlying problem. Using only a clarifier without addressing the algae through shocking and algaecide treatment is insufficient, as clarifiers primarily help to clarify cloudy water rather than eliminate algae.