Hey Jay,

Part of what you're saying is right there - in a way... quaternary ammonium compounds are very quickly deactivated by organic components... things like potting mix etc... what's important with these products though is to use the corerct dosages to ensure that there's sufficient active ingredients to do the job even allowing for some deactivation... they do work! quats are one of the best antimicrobial compounds around as they do their job and are quite specific to deactivating and breaking down cell walls of bacteria, fungi and viral particles

How are you babies looking? have they bounced back?

True, but I'm thinking that with some of the more serious bacterial infections pathogens are already inside the plant and only a systemic, such as Phyton 27, can kill them, where Physan, on the other hand, doesn't get inside the plant.

Absolutely agreed - Physan really is only a surface antibacterial so it's more suited as a preventative and also when there is an open wound that is infected or the surface is particularly porous and can easily absorb the active ingredients