Can-Air ECO Bottom Diffuser- Economical and Efficient! Can-air ECO is a smaller diffuser than the original can-air. It covers an area of 80' x 80 foot in 12 foot of water. Although not as efficient as the Can-air SS it is a good economical solution to aerate your pond. The ECO diffuser has 39 inches of fine bubble diffuser tubing and self sinking design which makes this small diffuser a winner! Easy to install and low maintenance.