I've had pools for close to 30 years and used chlorine, bromine and copper-silver elements, and this product is the best that I've used. I was cynical but thought that I'd give it a try for the 2018 season. I'm not a pool tech and don't want to mess with pool chemistry, so I've made many trips to pool stores for testing and advice and would virtually always walk away with different chemicals that over the course of the season added up, plus the bucket of bromine for the season. Hundreds of dollars. With this system, maybe I should have, but I rarely tested the water, including pH (but I do have a solid auto cover that I always keep closed when not in use or when sitting by it), and no one in the family ever experienced itchy skin or bromine smell, and we had beautifully clear water. (One "trick" I did learn towards the end of the season is using 18 ounces instead of 12 ounces of liquid chlorine once a week or so in my 11,000 gallon pool because with 12 ounces I had an ever-so-slight green cast. That did the trick for clear water, which I am a stickler for.) So no more trips to the store, and the only cost is the initial cost of the unit plus the little bottles of product to add every two weeks. No bromine for my granddaughter and grandson is a good thing.