Orchiata contradicting info??

[orchidsarefun]

There is no easy answer. Orchiata is sold in various sizes - I use the smallest size for moisture loving orchids like zygos and their hybrids and phrags. It seems to hold moisture longer. I use the largest size orchiata for Cattleya and dries quickly. All my phals are in sphagnum as I've found that is what they prefer in my conditions.
Watering epiphytes depends on ambient humidity and temperature, the requirements of the genus and the potting mix ( if any ). For example I mix varying levels of sphagnum with all my orchiata to increase moisture.
First things first - you need to establish the best sized bark for the orchids you grow and go from there. Generally speaking you should only water when the roots appear white or grey. If you can't see roots then you should only water when the weight of the pot is "light" compared to "heavy" just after a thorough watering.