What action should be taken if a pool shows signs of algae growth?

When a pool shows signs of algae growth, shocking the pool with chlorine is the appropriate action to take. Chlorine shock treatment increases the chlorine level in the water temporarily to a point that is effective in killing algae and other harmful microorganisms. This process involves adding a significant amount of chlorine to the water, which helps to oxidize the algae, thereby eliminating it and improving water clarity and sanitation.

Addressing algae growth promptly is vital for maintaining a healthy swimming environment and preventing further issues such as slippery surfaces or water quality deterioration. Regular monitoring and maintenance of chlorine levels in combination with shock treatments can help prevent the recurrence of algae.

Lowering the water level and increasing the pool temperature are not effective methods for controlling algae. Covering the pool might protect it from debris or prevent sunlight, which can contribute to algae growth, but it does not address an existing problem directly. Therefore, shocking the pool with chlorine stands out as the most effective response to combat algae growth in swimming pools.