How do you kill mustard in my pool?

To kill mustard algae in your pool, start by shocking the water with a chlorine shock treatment to raise the chlorine levels significantly. After ensuring the pH is balanced, scrub the affected surfaces with a pool brush to dislodge the algae. Run the pool filter continuously for 24-48 hours to help remove dead algae, and consider using an algaecide specifically designed for mustard algae for added effectiveness. Regularly check and maintain proper pool chemistry to prevent its return.