Active Aqua Air Stone Disk 

Active Aqua's new extra large air stone disc is a great way to add oxygen to your hydroponics system. 

The micro-pore design energizes your growing solution as it aerates and circulates the nutrients. You'll notice an extended life of your nutrient solutions, healthier plant roots and improved plant growth rate.

This flat round air stone is only 1" thick so it takes up very little room. The large 8-1/2" diameter makes it a good choice for larger sized nutrient reservoirs.

Works well with aquariums too.

Dimensions: 8.5" diameter x 1" thick