It's a list of all the people and things I hate so much I want to hit them in the face with a shovel.. Concept coming from the Marian Keyes novel, The Mystery of Mercy Close (2012).
Use chlorine as your go-to algae killer. When your pool water is green or contains visible algae clumps, your pool does not have enough chlorine. Shocking the pool with a large dose of chlorine is the most effective way to kill the existing algae and bring your pool back to sanitary conditions.
Remember, when you have a swimming pool algae problem, there is no quick fix. It will take time, effort, and patience to clear up your pool. When your swimming pool chlorine is down to 1.0ppm-3.0ppm the pool will be safe to swim in once again. At this point you can use a clarifier to help with the filtration.