We have to comply with stringent health and safety regulations. The water contains 97% salt so the solution is sterile. We add a limited amount of (swimming pool) chemicals to ensure it’s clean. We filter the water three times thoroughly between each float session. The size of our filter is 10 microns (for reference, the size of a human hair is 75 microns) so everything, no matter how small, gets trapped in it. Additionally, we test the water daily to ensure a sanitary environment.