When the roots are damaged, the plant is unable to take up enough water and nutrients to satisfy it's requirements and therefore is not able to close its stomata due to lack of potassium in the guard cells. Stopwilt supplies the potassium in an easily assimilable form. Potassium triggers the guard cells to close the stomata allowing water and nutrients to once again store correctly within the leaves and recover while the roots re-establish.
Use: ½ mL per litre of nutrient solution as a preventative and 1mL per litre if disease is or has been a problem.