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.
No, you should never swim in the pool while it is being treated with chemicals. These chemicals can be absorbed through your skin while swimming, which can be harmful. Copper-based algaecides, which are used for treating black algae, can cause staining, and can even turn blonde hair green.