We had it installed by a hot tub company to be safe and sure it was installed properly. They water is really clear now, but have to admit it is hard to tell if it's working or not because it works when the pump is on, and when the pump is on, it is circulating the water through the jets already but as said the water is really clear now whereas before it was cloudy because I was having trouble getting the water Ph and bromide levels correct. We are happy with the purchase and would recommend getting one for your hot tub