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A self-uprighting aeration device that minimizes turbulence and disruption of any sediment layer in a tank. The device includes a float positioned about a first position on a longitudinal axis of the aeration device, a ballast positioned about a second position on the longitudinal axis, and a diffus

A self-uprighting aeration device that minimizes turbulence and disruption of any sediment layer in a tank. The device includes a float positioned about a first position on a longitudinal axis of the aeration device, a ballast positioned about a second position on the longitudinal axis, and a diffuser. The float and the ballast are configured to orient the aeration device in a liquid with the longitudinal axis substantially aligned with a gravitational vector to dispose the diffuser above the sediment layer. The aeration device can be configured to rest on a support surface in the tank or float above such a support surface. Methods for aerating liquid in tanks with the aeration device are also provided.

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1. An aeration device defining a longitudinal axis comprising: a float positioned about a first position on the longitudinal axis and having an average density;a ballast connected to the float, positioned about a second position on the longitudinal axis, and having an average density greater than th

1. An aeration device defining a longitudinal axis comprising: a float positioned about a first position on the longitudinal axis and having an average density;a ballast connected to the float, positioned about a second position on the longitudinal axis, and having an average density greater than the average density of the float;a diffuser connected to the ballast, anda point contact disposed at an end of the longitudinal axis proximal to the ballast and distal to the float,wherein the float and the ballast are configured to orient the aeration device in a liquid with the longitudinal axis substantially aligned with a gravitational vector, andwherein the diffuser is interfaced with an external air source. 2. The aeration device of claim 1 wherein the average density of the float is less than a density of water. 3. The aeration device of claim 1 wherein the average density of the float is less than average density of the aeration device as a whole. 4. The aeration device of claim 1 wherein the float comprises contained air. 5. The aeration device of claim 1 wherein the float comprises fluxed air. 6. The aeration device of claim 1 wherein the float and the diffuser comprise an overlapping portion of a single tube. 7. The aeration device of claim 6 wherein the single tube at the overlapping portion is composed of a material having a density less than water. 8. The aeration device of claim 1 wherein the average density of the ballast is greater than a density of water. 9. The aeration device of claim 1 wherein the average density of the ballast is greater than average density of the aeration device as a whole. 10. The aeration device of claim 1 wherein the ballast comprises an enclosed tube containing a ballast insert. 11. The aeration device of claim 1 wherein the ballast, the float, and the diffuser together comprise a series of hollow tubes conjoined end-to-end. 12. The aeration device of claim 1 wherein the ballast, the float, and the diffuser are comprised of a single hollow tube. 13. The aeration device of claim 1 further comprising a diffuser control tube disposed about the diffuser wherein a sidewall of the diffuser control tube is substantially continuous. 14. The aeration device of claim 13 wherein the diffuser control tube comprises an open first end and the aeration device has a buoyancy to position the open first end at or above a surface of water when floating therein. 15. The aeration device of claim 1 wherein the aeration device has a buoyancy to position a bottom end of the aeration device in water at a depth of no greater than 5 feet. 16. The aeration device of claim 1 wherein the aeration device has a buoyancy to position a bottom end of the aeration device in water at a depth of no less than 5 feet. 17. A method of aerating liquid in a liquid-filled tank with an aeration device as recited in claim 1 comprising inserting the aeration device in the liquid and feeding air through the diffuser and into the liquid. 18. The method of claim 17 wherein the inserting the aeration device in the liquid comprises submerging the aeration device within the liquid, supporting the aeration device on a floor of the tank, and maintaining substantial alignment of the longitudinal axis of the aeration device with the gravitational vector. 19. The method of claim 17 wherein the inserting the aeration device in the liquid comprises floating the aeration device within the liquid and maintaining substantial alignment of the longitudinal axis of the aeration device with the gravitational vector. 20. The device of claim 1 wherein the external air source is a positive displacement air pump.