The blue appearance is actually just light refracting off the interior pool finish. If the interior was painted pink, the water would look pink. The green color was from live algae present in the water. A satanizing agent, a combo of chlorine and algaecide (kills the algae), and the filtration system catches the impurities, restoring water clarify.
[Video] Building a Swimming Pool Inside an Arena
November 24, 2020