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.
Swimart's tips for turning your pool from green to clean: Check your chlorine levels. If below 0.5ppm you need to 'shock' the pool water with a large dose of chlorine to 10ppm. Ensure the filters are running and don't use the pool until the chlorine level falls below 3ppm. Lower the pH levels by adding acid.