Just checking in with those long-time SWG users - Who has the oldest TCell15 that is still working? I installed mine beginning of 2012 season, and it is still working. I run my pump at 100% for 12 hours, salt generation at 30% in my 20,000 in-ground vinyl pool. I think oversizing the cell and using at lower percentages and cleaning are the trick. I also remove and put it indoors during Central PA Winters. How are others doing?