[NepNut]

Thanks paphioboy, marvin, CN and phongchansenh for your kind comments.

K. Pop,
Actually, for me it has more to do with well draining than having trace elements with inorganic media. So far, I have yet to see any detremental effect on my neps by using such media and I mean most of my neps except for those epiphytic neps like some form of N. veitchii.

However, to use burnt clay properly, you have to wash it or sieve it to get rid of the powderly dust if not when the dust got wet, it'll become muddy and drainage will be poor. I rarely use 100% burnt clay mainly due to the weight issue since it'll be too heavy to safely hang a pot full of burnt clay. In this case, adding more perlite or pumice will be very helpful.

Thanks for telling me the substrate is called "Silalang", I have seen that before used by Thai growers and always wonder what it called... Yes, inorganic mixture is very useful during rainy season.

I feel the most important point is to provide a suitable media depending on species and hybrids. As I slowly learn growing neps, I see myself using more and more inorganic based media (80% - burnt clay + river sand + perlite / pumice) with a little organic media mixed in (20% - SM/coco chip/cocopeat).