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Thanks for the good information. After reading a little more and seeing a picture of mustard algae, I think I have green algae, just a lot of it. Will continue to fight with shock levels of chlorine. Unfortunately chlorine dropped to 2 when I got home from work today. The weekend should make it...

Yellow/Mustard algae is a possibility since I did notice a lighter green slightly yellow in the shallow end the day after adding the algaecide. Is the higher chlorine shock level + algaecide the way to go? Today is day 4. I added 1 bottle of algaecide 4 days ago and have maintained chlorine in...

Opened a very dark green pool this year. Probably had some unresolved issues at closing. After adding algaecide (28oz of Poly 60) and chlorine (liquid from carboys), and vacuuming and brushing several times over the last few days, the shallow end is getting clear, but the deep end is still...