What is Biofilm? 
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. 
For more information and remedy check out: Dazzle Water Care.