posted by Henry2 .
I urgently need you to see if the sentence is OK now. Thank you!!
1) Moreover, this particular bacterium can survive in presence of arsenic and, therefore, won't die until its action of purification is completed.
2) This method is inexpensive and affordable even for those countries that can't or don't want to spend as much money as needed to safeguard their (not its) water resources.
Both are correct, yes.