If the water in your pool has ever become green, then you know how yucky that can appear. Is it unsightly? Yes. Is it a nuisance? Sure is. Is it dangerous to humans? Generally speaking, the green algae itself is not harmful to people, but the bacteria that feeds upon it can create certain health issues.
First of all, that bacteria can cause skin conditions, such as rashes and breaks in the skin. Secondly, since algae can be quite slippery, it can cause you to lose your footing in the pool. This could lead to bumps, bruises, and maybe even a broken bone. Thirdly, a pool with algae is a cloudy pool, which inhibits visibility. If someone was struggling to swim, that individual might not be as easy to see as they would be under clear water conditions.
So, what does it take to kill algae in your swimming pool and keep it from returning?