Opened the side panel today to start draining and noticed that there was an air hose disconnected. Upon further investigation I found that the plastic nipple that attaches to the ozone injector had broken off. So the hot tub hasn't been getting oxidized! I replaced the nipple, cut the hose and re-attached it. There is a slight noise coming from the air tube, like there is a bit of water in it, is this normal as it's pushing the oxidized air into the water somewhere?
By the way, how does this ozone thingy work? Should it be cleaned? Does it have a filter? Should something be re-charged or filled? This hot tub is from 1994 and we bought the house about a year ago, so just wondering what the maintenance is on this. Thanks!