Yes I do feed the water through the bottom. I use the bubble stones and water level to get the water to splash up on the bottom of the net pot. As the roots grow more, I lower the water level a little. Its all in the bubble stones making so much splashing that keeps the roots and medium wet until more root growth comes. I have been told before to use a drip or something to feed the water from the top down, but I have done it this way and had success in the past. Hopefully the controller I am building will make this task easier.