For some reason I can picture you snorting when you laugh -- How would you know if someone who had a yeast infection entered your tub? Or say head lice, or scabies or impetigo? Those are all highly contagious skin conditions -- But I am sure if you put 15 or 20 TBS of dichlor in your tub before your guests enter then you should have enough sanitizer to kill those nasty buggers or at least give your guests severe skin burns -- but hey, it's better then the alternative.