I have a korkly 528 automatic water leveler. I saw that there is a leak on the PVC pipe that house this korkly water leveler. I am not sure where does the leak come from. It appears to me that the water leveler did its job, but I am not sure why there is trace of water on the PVC pipe and this trace of water go to the pool deck. Am I having a leak underground or something wrong with my water leveler.

What pipe material was used between the house supply and the Korky, no L in Korky.

It is a PVC housing pipe. The korky is inside this PVC pipe. Water fill portion of the PVC pipe. This PVC pipe is located inside another PVC pipe, I called it outer PVC pipe. The PVC pipe is attached to the pool deck.