Hmm! Can't help with the coir question as mine are in bark or clay pellots. I use plastic pots with the pellots, but have heard of others using the pellots in clay pots. With the plastic pots, I have a 2 inch water reservoir in the bottom of the pot for the clay balls to wick up to the roots of the orchid. If you use clay pellots in clay pots, you might put them in drip trays and have the wicking action occur from water in the drip tray. since the clay pot will also wick moisture up its length, you would be increasing the moisture around the plants roots untill the water in the drip tray is evaporated or wicked away. This might cut your watering to twice a week instead of every other day.