run off evaporation

i got a high ppm/ec read on one of my plants run off water. I did only one feed of Athena blended and it was 600 going in. They are a little droopy and I thought it was from over watering but could it be from them having to much nutrients built up in the soil? Should I flush with pure ph’d water...

Hi I have the start of white powdery mildew I think. Anyway I have the black saucers and elevators for my fabric pots. After watering plants I left the run off in the pots so its a white residue.. can I spray it with peroxide and kill it or tea tree oil or mix them with water? I was just gonna...