Why is the pool green? More importantly, how do you get rid of algae in the pool and make the water sparkling clean again? You can test and balance your water chemistry, and even shock your pool to clear the water. But for persistent pool algae bloom, we recommend using an effective algaecide to get rid of pool algae and help prevent future algae growth. Browse our selection of algaecides and so you can get back in the pool soon!