Algae can be killed using various methods, including chemicals, enzymes, and physical cleaning. Here are some ways to kill algae:

• Chemicals: Chlorine is one of the most effective killers of algae, and a super-chlorination of 10-20 ppm of chlorine can go a long way towards wiping out the algae. Bromine has been shown to be an even faster killer than chlorine. Algaecides are also effective for early-stage algae growth, small amounts of algae, or as a preventive measure.

• Enzymes: Enzymes can be used to clean up oil and non-living organic debris, which could cause chemicals to degrade faster. A broad-spectrum concentrated enzyme can help break down any additional non-living organic material.

• Physical cleaning: Brushing the pool surfaces (walls, floors, and steps) weekly to remove algae that may be building up is one of the best ways to prevent algae. Scrubbing the algae off your pool surfaces helps the shock treatment work faster since the algae is floating in the water rather than stuck on the walls or floor. Vacuuming and brushing your pool, then shocking and filtering your water can help get rid of green algae.

It is important to note that different types of algae may require different treatments. For example, black algae can be treated with baking soda, while blue and green algae can be treated with borax. Regular maintenance and testing of pool water can help prevent algae growth.