The GLB Swamp to Swim Shock System is a savior for pools with severe algae blooms that have casued the pools to seem like a swamp. Use this product to help turn your green swampy water back into a crystal clear pool. It is a 2 step system that will kill bacteria and algae that has infested the pool. After the treatment is completed, the unwanted contaminants are then easily vacuumed away and washed off of the filter. Order this product to save your pool.