I'm no expert on orchids, but I have 50 years experience growing other plants, and raising tropical fish. The idea behind a water softener is simple. The calcium and magnesium ions in the water are replaced with sodium ions. I never use softened water on any of my plants. I've also read that you should avoid softened water in aquariums too. Nothing beats rain water in an area that does not suffer from industrial air pollution, for watering plants. With all that said, if your orchids are flourishing, I'd change nothing!
