Flowclear Pool Cover 3.96 m. Keep debris, leaves, and trash from getting into your pool with this Flowclear PVC pool cover. Above ground swimming pool covers prohibit algae growth and reduce costly replacement chemicals when the pool is in not in use. This pool cover has drain holes to prevent water from accumulating on the cover. The pool cover is easy to install, extremely durable and includes ropes to secure the cover to the pool. Fits 3.60 m x 1.20 m diameter Hydrium Pools.