Gurjeet, you could try out a simple experiment before you plant your orchids in it. Just take your SH pot fill it up with these pellets and water. Weigh it on day one and then weigh it every day at the same time, see how much water is evaporated everyday. If there is capillary action a lot of water will evaporate. Another test to see if there is enough capillary action would be to take one of these samll brick pieces from the top layer in the pot and touch it slightly either above the lip (between the nose and lip) or under the lower lip between the lip and the chin. These spots on our body are very sensitive to temperature and moisture. You will feel the moisture or if it is dry. If after several days you notice that the wtaer is evaoratinf and that the pieces on the top are moist, I will conclude there is sufficient capillary action to support orchids.