You only have a 30L res... so if you want, buy a few jugs of distilled r/o water from the grocery store, and make a new res with general hydro grow/micro or dynagro grow.
That will take your tap water and canna nutes out of the equation.Honestly though.... stuff those in the garbage disposal and start new beans first.
I will try your advice.Are these damaged for life and they will not recover? I don't wanna start over again because i don't have time for it before the summer.I just wanna try my best on those if possible and make sure the next one will be a nice one.