This lettuce is an example.
Before using the pebbles in the netpot, I'll thoroughly rinse the clay pebbles until water runs clear, about 3-4 times.
After, I will soak the hydroton in ph 5.5 water for around 3-5 hours.
The end result is the side roots emerging out the net pot, rather than having bottom only roots.
Works great in kratky so plant can develop aerial roots for taking in oxygen.
Top layer will dry out.
Middle and bottom remain moist.
It is time consuming but worth the effort.
So, to whoever has problems with their seedlings, root rot, give this a try.
by Valerie304Sanchez