In lieu of Physan or Clearys

[Jayfar]

Originally Posted by orchidsarefun

Regarding the Physan20 - I had 3 outbreaks and it may be coincidental but they were at or around when I was doing preventive spraying. So, about 3 over 8 months.
I have stopped using it and I haven't had any outbreaks for about 4 months. Does this stuff "go off" ? I noticed a blackish residue around the inside of the lid/top too.

What is HighSeas ? Can't find any product listing
Castillian Soap ?

It could be a matter too weak a concentration of the physan killing off the weaker bacteria and other pathogens, basically clearing the deck for the strongest pathogens to take hold. It's the same phenomenon hospitals are plagued with, new antibiotic-resistant strains arise requiring new antibiotics to fight the new strains (lather, rinse, repeat). That's why many growers recommend using treatments with different anti-pathogen chemicals in rotation.