Name: Jim Northeast Pennsylvania (Zone 6b) Gardens feed my body, soul & spirit
I never heard of Physan until I read this thread. I was just about to use a bleach solution on the backs of my two solar collectors that are starting to show some black mold (I think)...probably because the rear of these collectors never get any sun. Went to their website and read all about it. Just bought a 16oz bottle online. I'm going to clean the whole greenhouse with it.
