What colour is algae? Sherralyn October 01, 2018 23:24 Updated Follow Algae can come in several forms. Pink, green, yellow or brown film or slime. We suggest using Poppits Pool Algicide to get rid of it. Related articles What product will remove algae from my spa? When adding algicide, do I need to clean my filters? What can cause itchy skin and eye irritation? Why do I have a brown scum line after using poppits pipe degreaser ? Can I use Bromine tablets & floating dispensers in my spa? Comments 0 comments Article is closed for comments.