Finally after all these years a new procedure to disinfect the water system lol. That'll do it..............
Get a large bag of baking soda. Flush the system a few times with fresh water then mix up a load of baking soda and water in a bucket without being stingy with the soda, dump that in the tank, fill with more water and flush that through all the lines and let it sit a few hours. Then flush it all again.
You're done.
They way things go on these boards the fear mongers will eventually have you ripping the entire system out and replacing it or possibly totaling the entire rig.