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.
Follow brushing with pool shock, then a treatment dose of algaecide formulated to treat yellow / mustard algae. As always, follow label directions and pool chemical safety guidelines when treating algae in your pool. And remember, using algaecide weekly in a preventative dose will keep your pool clear and sparkling.