KLN and Superthrive are not fertilisers but root stimulators.
Orchids need weak rooting hormones and powder ones don't really work with them. However KLN has has weak rooting hormones and other ingredients that help stimulate root growth in orchids. It's a liquid that you add a few drop into the watering water. I've not used superthrive but it's similar.
Orchids can be mounted on large pieces of bark or cork or even rock rather than potting them. Their roots grip to the bark and they are watered by spraying or by dunking the whole orchid and mount in water. In the wild Phalaenopsis grow clinging to trees as do many other types of orchids, others grow clinging to rocks. There are some that are better potted but the ones that grow on trees or rocks do well mounted. It's a great way to grow orchids, but is somewhat difficult indoors as you need somewhere they can drip after watering. I keep my mounted ones on the bathroom (tiled) windowledge in the winter and outside or in my greenhouse in the summer.
Anyway, the fact that these grow on trees explains why they like plenty of air around the roots. In the wild phalaenopsis grow in the rain forest and have water running down the tree trunks and over the roots, they get plenty of water but also have their roots in the air and get plenty of air. Phal roots also photosynthasis as do the roots of other orchids in the same group, which is another reason they do well mounted or in clear pots.
Another way to grow in a technique known as Semi Hydroponic. This uses Lecca, an inorganic medium and keeps them wetter than you would usually do. If you keep them too wet in bark it breaks down quickly and the holes between the pieces fills up... so no air flow. Also toxins can be released by the decomposing bark. Using Lecca which does not break down they can be kept wetter and without loosing air flow which once they adapt to it they can really like. There can be problems with orchids like Phals in this in cooler climates though as the evaporation can cause cooling in the Lecca and the roots which they don't like. I use a heat mat to combat that though.
Here are a couple of links to places on our forum for mounts and Semi Hydroponic.
Growing on Mounts