We just recently moved into a house with a hot tub and the previous owners gave us everything they use to maintain the hot tub. They never used chlorine or bromine and just used the ClearChoice Spa drops. Our water is crystal clear and it doesn’t have a smell. I tested it and the chlorine level is low (obviously) and the PH was high. Does anyone else use these drops and how do I know if my hot tub is safe and free of bacteria?