Grow mediums and substrates for hydroponics.
Microgreen Fiber Paper is used as the substrate for growing microgreens hydroponically. It ensures clean growing and ease of harvesting.
Rockwool is a nice clean media that has a perfect Air: Water ratio and comes in a ready to use cube format. When hydrated, each cube has a consistent 80% Water 20% Air ratio which makes it an ideal media for hydroponics as it is difficult to overwater the cubes. This prevents seedling problems such as damping off.