I suppose one could put pond water through it and go get it tested…I am in agreement with you ........I read that part also . It looks like ( from cbhausen`s link ) that the new ones address all the heavy metals you could think of , but nothing microbiologically unsafe . I am more interested in filtering out virus and bacterial related .
After reading several stories , I am not sold on the Black Berkeys ( and we have several ) performing as claimed .
We use one daily , but have never used or tried it with pond type water just to see if we don`t get sick .
If forced , I suppose we will boil and add our bleach stock solution for now ?