I found the flippers on the left and right sides of the Navigator coming off in pieces. Instead of a semicircular shape, each has chucks missing. The navigator has not been moving very well. So recently flow was adjusted by a professional pool man so that it is moving at adequate speed to have meaningful suction. The flow was determined by a gauge he had.
In addition, after the navigator was fixed, I shocked the pool because of algae. chlorine = 18 (CYA 50), navigator was left in b/c I didn't know it needed to be removed.
Why are the plastic flippers broken into pieces? very strange disintegration. Are the recent events related?