However, some organisms create toxins which can pass through filters and will not be destroyed by boiling.
And that right there is the rub. During the summer months I store 40 extra gallons of water (heavily bleached--more about that later) in the water tank of my travel trailer. During the day it gets to be over 90 F. (sometimes over 105 F.) I'm wondering if that water, if compromised by pathogens, can be made safe by boiling or is it risky no matter what?