Minerals can help maintain water quality and clarity. A weekly addition of minerals will also help reduce algae or biofilm. Your hot tub will require less sanitizer. It's still necessary to balance the PH and use some sanitizer to keep the water safe.
Biofilm is a rapidly reproducing colony of microorganisms surrounded by their protective slime in an aqueous environment. They grow on surfaces where water doesn’t flow and prefer environments where water is stagnant and void of sanitizer. In hot tubs, they are often found in the pipes where the water flow has been stopped or dramatically reduced (i.e. diverter valves isolate certain therapy returns, waterfalls where flow has been shut off, etc.). Biofilm is noticeable after water flow is returned to isolated pipes and is ‘blown’ back into the hot tub in the form of floating particulate that appears as tiny pieces of ‘skin’ or torn up pieces of tissue paper.
