However, for a hydroponic system to be effective, plants need sufficient CO 2 — and that's where an air stone comes in. An air stone is a porous device that sits at the bottom of an aquarium and ...
However, for a hydroponic system to be effective, plants need sufficient CO 2 — and that's where an air stone comes in. An air stone is a porous device that sits at the bottom of an aquarium and is ...
However, it is less known that indoor air pollution is almost as bad as outdoor air quality, although the pollution is less visible indoors. In fact, most of the air pollution from outdoors seeps into ...