Unit is freezing up again. We put 1# freon in last year. Interested in Stop Leak. System needed 1 lb of R-22. Customer would like to monitor the system this summer to see how it works. If no more R-22 is needed for the remainder of the summer, we will return next AC season to see if more R-22 is needed and if further steps will need to be taken. If AC system needs more Freon before the summer is over, leak stop maybe needed. System is operating normally at this time.