Rashes can be caused by a number of different factors including but not limited to, high or low sanitizer, improperly balanced alkalinity or pH, bacteria, heat, etc… Unfortunately it is a bit of a trial and error to determine what is causing the rash. You can visit your Doctor and discuss options or come in and talk to a water care expert in the store. Start by testing the water and ensuring safe water balances.
Next try to recall if there was anything you did differently this time that may have caused a different reaction. Sometimes switching from chlorine to bromine or vice versa can cause problems. Other times it might be that you had a group of friends over and the tub had heavier than normal usage but didn’t get heaver than normal sanitizer treatments.
In many cases we have found that individuals who struggle with hot tub rashes are given relief when they switch over to the Mineraluxe system.