My hot tub is a 2-3 person marquee tub/110volt. How much salt do you add to the water ? And how often?

Hello John, the amount of salt is based on how many gallons of water your hot tub has. It is roughly 1 lb per 100 gallons, but the MiniChlor will actually indicate if you have to little or too much salt in the water. Typically you only have to add salt when you change the water. If you splash out a lot of water and top off your tub, that may dilute the salt concentration and require you to add a little more.