Meh ide flush. Your roots are in a toxic environment fix it.
Just let them dry out after don’t do it for a week long lol.
This is the issue with soil like I was saying it’s soooooo much more work then coco and its worse results.
If it was coco you just feed every time. Change it every week according to the feed chart.
In soil you water until the run off is below what it should be for that week on the chart.
Then you do the calculations as to how many tds you need to bump it up.so mix up a batch (to keep ratios correct) then you dilute it to the correct ppm for that plant and feed it.
Do that for each plant…
Now if your in autopots you fill the Res once a week with water and mix it to that week’s tds marker, PH it and come back next week.
See why I hate soil?