Mold in Hydroponic Solution Concentrate
My hydroponic lettuce solution, the concentrate, has a layer of powdery green mold on it. I tried to strain it off, but am uncertain if that is enough? Please help.
I mixed a bag of lettuce nutrient (powder form) into 5 gallons of water, as my concentrate--as per the directions. I mixed it in a 5 gallon bucket and covered it with the attached lid, tightly.
When I came back to mix another batch of solution 10 days later, there was a thick layer of green powdery mold floating onto of the solution. I skimmed it off and put it, uncovered, in the sun.
1. Do I have to dump the solution?
2. What can I do to prevent it in the future?
3. Should the plants that have already been fed with this solution be destroyed?
Any help or information that you can provide will be GREATLY appreciated.