Kleeem
OK, going by what you first stated your problem seemed to begin after a heat snap. But now you have mild days and your water temp is not high at all. So the beginning of the problem may, or may not have just been coincidence, and what you describe is different than the damage from high
nutrient temps. It sounds like you did a good job with trying to sterilize the system. I assume that along with running the bleach water solution through it, that you also scrubbed it out with soap and water first because you say you scrubbed the components.
But you say your getting airborne contaminants in the system. Do you have any pictures of the system, and/or how it's constructed (plants etc.)? I also forgot to mention that there may be a possibility of fungal diseases as well, especially from airborne contaminants. Spores are so small you cant see them and travel in air currents, all they need is water and the right temperature to begin to grow. An
aeroponic system is a great place for them to thrive. There they have complete access to all the roots for food as well as
nutrients in the solution, with nothing to herder it. And sanitizing the system won't keep them from being reintroduced through airborne contaminants.
P.S.
How often do you change the nutrient solution?
What type of nutrients and/or additives do you use? Concentration etc.?
What type of
growing medium do you use if any?