Losing 1'' per day.The only thing I have changed is that I added a pool skim on one return line and a suction cleaner to the vacum line. I have checked all external plumbing and found no visible leaks. The return lines are not accessible as they are underground. The pump cavitates a little but the vacum line is 30mm pipe (the wall fitting is <30mm) so I think this would be normal when running the cleaner. The water level drops more when I run the cleaner. Any suggestions?