The test app indicates high cyanuric acid (CYA). What should I do?

You can think of cyanuric acid (CYA) as sunscreen for your chlorine. While we do have a CYA (for pools) Stabilizer agent reading on our test strips it is there for pool owners only and is not applicable for hot tubs because other than the time you are in your hot tub you will have the cover on it and therefore your water is not exposed to direct sunlight for long periods of time which means your chlorine is typically not breaking down because of the sunlight. If you want to lower the level then drain some water and replace it with fresh water.