Thanks - I am planning to try the torch over the weekend. To the other person asking if my pool is SWG - yes, it is. I installed the system this year. By the way, worked like a charm - once I was able to clear the initial conditions (previous owner did not open the pool for several years!), I enjoyed crystal clear water all season long with zero chlorine additions. Pump was working for only 6 hours every night and there was no chlorine smell or miscoloration of the swimming suits. The neighbors, using the regular chlorine shocks were fighting algae all August and had chlorine smell so bad we could sense it when there was wind coming our direction.