Hydrogen Peroxide H2O2 will add oxygen to the water and kill many disease causing organisms and spores and it will drive out the chlorine many cities use to sterilize the water, it will also degrade any pesticides or herbicides, but it also kills the good organisms. It is also useful for suppressing algae growth. It will destroy dead organic material (leaves, roots) preventing them from rotting and spreading diseases. Again it does kill the good organisms as well as the bad.

Good Kannabis Growing!

Quote Originally Posted by AtomicToad
I would have to vote on too much water. Let 'em dry out. The other thing you can do is use H202 (Oxygen Plus) and that helps feed oxygen to the roots...