I have had a constant battle with algae growth on my pool deck surface (Kool-Dek) since pool was installed about 2.5 yrs ago. I was if anyone had any input on how to fight the battle? I have one area where the deck has a low spot and it puddles which obviously does not help, but there is also other areas of the deck with problems that have a proper slope still grows algae quickly. (pool deck is shaded alot of the day and that is root cause I am sure) I am tired of bleaching/pressure washing every 2-3 months. I know they make sealers but not sure if they would help and I fear they might yellowing/peeling etc. , not sure about durability of the sealed surface. Anyone have any advice?