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? What is your Return Policy? What temperature should my water be when using Poppits Quick Fix? How do I switch to BioGuard Armour if I have been using Lithium? Why do I have white flakes in my spa? Comments 0 comments Article is closed for comments.