Originally Posted by
Lambert
A website had tested the different S/H pellets and found out that Hydroton and Aliflor had weak wicking capacity and Primeagra, Seramis and Blusana had strong wicking capacity, meaning that with Hydroton and Aliflor the top part of the pellets will dry out faster. Which is not necessarily a bad thing because it creates 3 distinct zones in your pot (submerged, humid and dry)
Even though the top pellets are dry in the "dry zone" , the air evaporating from the humid zone is still saturated with humidity, which is helpful if you are transitioning an orchid to S/H, instead of submerging the roots right away.
They also suggested adjusting the size and height of the pots depending on whether you wanted a dry zone or not.
Lastly, the smaller the pellets, the more they will retain water and the stronger wicking capacity they will have.