I have problem with the pump cavitation . I have checked for suction leaks and had a leak detection company out to test and they have found no leaks.I have snaked the suction line from the skimmer back to the pump. Blown the line out with water pressure and air. Replaced pump lid gasket and replaced impeller on pump. Running out of ideas. Next step is to run a temporary line from the suction side of the pump directly into the pool to see if the problem disappears. When pump is running can see lot of bubbles thru lid on pump and have to bleed filter of air every 30 minutes. Problem started out of the blue. No resent changes were make to pool equipment. May try to install filer cartridges but I have a feeling this wont help. Running out ideas.If anybody has experienced this problem and resolved it please let me know what you did.