Air Stones - Blue 

Compressed silicate air diffusers (a.k.a air stones) help increase oxygen levels in your nutrient reservoir. 

Simply connect the air stone to your air pump with tubing. The air pressure of the pump creates the aeration that increases oxygen saturation.

Lays flat on the bottom of your reservoir to prevent plant root tangling.

For a 10-gallon reservoir, use the 6" Air Stone. For a 20-gallon reservoir, use the 12" Air Stone.

Connects to standard 1/4" tubing. Also works well in aquariums.