Aquafinesse is GREAT!
This product simplifies my maintenance of my Spa to the point that one need only add chlorine/bromine. I have used it exclusively for the past 9 years, application ranging from once a week to once a month, depending on use of the spa and test-strip readings. The under water surface of the tub feels "squeaky" clean rather than having a slippery, oil-like feeling. Great product and I highly recommend it.