I use a 2000 gallon sistern for all of our water use, except to drink of course. Problem is, cant keep my young ones from drinking the bath water. I filter the water with yarn type filters, but I know bacteria must be active in the water. Is there some device that may assist me further in killing what might be left in my water? My thoughts are with a light based killer, like what people who make cider and maple syrup, but that is as much as I know. Thanks!