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Hello! I have PPS+PRO solution prepared from 2016. I also have a lot of dry fert left since then. Should I continue to use the solution or make a new mix from left over?
The reason I ask is, I think the solution is not performing as good as it used to be. All along I stored them in dark and at room temperature.
Is your experience similar? Thoughts?

 

[Mark Fisher]

The chelated iron in solution is probably not usable. I'd start with a new mix from your leftovers.