Scum in DWC systems
Interesting issue.. I have one DWC (pepper) that has grown some kind of white scum over the airstone and root system. Its the same as all the other setups I have, and uses the same nutrients. pH is at 5.5 and nutrients are at about 1000ppm. Nute temps are around 70f.
Its light tight and is the only one with this problem. I cleaned the pot out with bleach, soaked the air stone in it too, and flushed the net pot out with water till there was no more scum on anything.
I treated it with H2O2 and its been fine ever since, but I'm curious if anyone has any ideas what caused it?