Just to elaborate a bit further.... so if a plants roots sit in a water solution that is actually too high in electrolytes (like if you feed pure Brawndo
) the plant is going to shut out some of these electrolytes, and even spill some of these that were taken in, back.
But because the amount of water stays in this solution is getting more & more salty, and these salts crystalize directly around the roots at the rhizosphere. This can even happen in an organic grow - but sort of slower.
So usually you don't want to flush an organic growth, but in this case with a really sharp soil there simply isn't much else of what you could do...
Then for the next run stretch that soil down with a combination of (a) washed cocos (~30%) (b) bio charcoal NOT activated (so just charcoal broken down) (~10%) and (c) tiny clay pebbles (~10%) so the EC will likely decrease to 40-50% of what it is now.
Hope this helps you a bit