Question:
How can Bacillus Subtilis be used in Water purification?

I've heard [and seen many websites that don't offer enough detail, sadly] that Bacillus Subtilis can be used in purifying water. There's even a sort of concrete product utilizing this bacteria [and two more] in purifying water. I'm just wondering if:

1) if it is really feasible...2) if it can do it on its own [I mean no other added bacteria or chemicals. Just simply B. subtilis...

Answer: B. subtilis strain QST 713 (marketed as QST 713 or Serenade™) has a natural fungicidal activity, and is employed as a biological control agent. Therefore it is possible to purify water of unwanted organisms.

A strain of B. subtilis formerly known as Bacillus natto is used in the commercial production of the Japanese delicacy natto as well as the similar Korean food cheonggukjang. Therefore if you proceed with using this gram-positive bacteria and besides it is not considered a human pathogen.

As to whether you can do it on your own, just believe and you can