That’s what I have been doing. Once each day and they show signs of burning.You’re positive roots are in the soup? Suggest pouring through a couple of times a day for a while. Meaning take solution and pour it down through the hydroton. Hand feed.
Lower to 175-200 ppm. Pour through more times a day and before lights out. Keep going unless it croaks totally.That’s what I have been doing. Once each day and they show signs of burning.
Roots are not in the water.