Re: Very odd odor
These fungi dont live IN the potable water system ... and if they are odiferous, its not coming from the potable water system ... unless the vent line is inside the boat.
Carefully check the 'wet' bilge as a starting point ..... etc. ;-)
BTW - That 'recipe' for fresh water sanitization is for the commissioning of *new* or freshly 'cleaned' tanks. Aint for 'dirty' or contaminated.