I keep my SWG North Texas (Ft Worth) pool open year round. I have no backyard trees. My vegetation surrounding my pool is Crepe Myrtle and Red Tip Photinia. After a winter of keeping up with my pool and having decently balanced chemicals I noticed this past week a yellow/greenish growth on my vertical pool surface in one end of the pool.
My wife works with several local cities as a swim instructor and one of the city pool guys claims Crepe Myrtle pollen can attach to pool walls and look like mustard algae.
Anyone ever hear of this? Just curious. My Crepe Myrtles have started growing from winter dormancy and this end of the pool DOES have 3 near by.