We use Nature 2 and our water is balanced. The water WAS nice and clear and free from foam until we tried some of that aromatherapy liquid. We couldn't notice much of an odor coming off the water surface as we expected to. However, we could smell it on our skin. Gradually foam started to form. After three or four soaks of an hour each the foam got to be an inch thick. We added a chemical foam reducer, but the effect was short lived. The foam came back. After going through a pint of chemical over several spa uses, it didn't seem wise to continue dumping this stuff into the water. We managed to keep the water balanced, but the foam remained. We shocked with chlorine, but the foam was back the next time we used the spa. We also cleaned the filter. If we did not use the pump on high we had little foam, but we like it on high with the air on. We have the Artesian Azalia 150 Gallon 2 person spa. We plan on dumping the water and starting over as a solution to getting rid of the foam. Is this aromatherapy stuff known for problems like this? I know that we will never use it again.