My pool was fibreglassed one year ago and is now developing green algae on the sides. It cannot be brushed off and I have been told to reduce the ph to 6.8 and the chlorine to 1 as the carbonate in the chlorine is now clinging to the walls. I always thought that a fibreglass pool was smooth which makes it difficult for algae to attach to. Is this the correct advice?

Please can you let me know the best way to clear green algae, which is now rough, on the sides of a new fibreglass pool.

thank you so much