Removes stubborn algae from pools, hot tubs and spas to leave you with cleaner and more clear water. Helps to prevent algae from returning to make sure the water remains algae-free! Makes removing algae simple and easy - perfect for pools where algae is a common occurrence and can be really difficult to remove. For your peace of mind, this product is perfectly safe to use in all types of pools. Easy to use and a professional formula for incredible results.