We have not been using our SWG for at least the past 2 years. My husband "did the math" and stated that we would need a new cartridge for $500 to get it operational. Does a SWG actually save money considering how quickly these seem to fail and need additional investment? Especially given time of use electricity levies, I'm not sure. I'm rethinking my solar heating for the same reason. Perhaps installing a gas heater and running it at night when time of use is less is actually a good idea, especially given our short swim season in Canada. My husband is also thinking our Enersol solar panels are getting pretty tired (installed 2006) and often need maintenance to stop leaks which drives him crazy. Thoughts?