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.
Confidence votes 16. If your pool water turns green after it is shocked with chlorine, it is too basic. Algae can thrive there now and it is green. Add pool acid (it may require several gallons) and check the pH of the water frequently, adding more, if needed.