---

First, you must add the algaecide according to the directions. If you don't add the correct dosage amount, it won't kill any of the algae. However, be aware that using the entire bottle of algaecide is also ineffective. Not only will you spend additional money, large doses can also lead to staining and foaming in your pool. In addition to properly dosing your water, it is also recommended that the algaecide be added in the morning on a bright sunny day for best results.

Algae are plants and grow in the presence of sunlight. Adding algaecide during algae's best growth time will increase intake of the algaecide and make it more effective. If black algae is present, brushing the algae at least once daily will also help expedite algae removal. Brushing the dead cells away makes the living algae more vulnerable to the algaecide.