Sand and non-circulatory hydroponics?
I'm new to gardening and would like to try non-circulatory hydroponics...in sand. I've read that sand is only to be used in run-to-waste hydroponic systems. Why is this? Sand is inert and can be sterilized. Why can't it be used in something like a non-circulatory hydroponic system? And has anyone tried this? Also, any tips on making hydroponics more sustainable?