Fine bubble delivery for potable water, wastewater, and clean water treatment

A flexible tubing for fine bubble aeration, comprising:

• an upper portion and a lower portion generally defining the tubing, the tubing having a proximal end and a distal end;
• an air passageway defined by the upper portion and the lower portion;
• a plurality of micro-slits through the upper portion and communicating with the air passageway and the outside environment;
• and
• a substantially hollow secondary lumen defined by the lower portion, adapted for passing a fluid therethrough when the tubing is submerged in a body of water, extending from the proximal end to the distal end, and isolated from the body of water.

A flexible tubing for fine bubble aeration, comprising:

• an upper portion and a lower portion generally defining the tubing, the tubing having a proximal end and a distal end;
• an air passageway defined by the upper portion and the lower portion;
• a plurality of micro-slits through the upper portion and communicating with the air passageway and the outside environment;
• and a tether embedded in one of the upper and lower portions separate from the air passage, extending beyond at least one of the proximal and distal ends of the tubing, and adapted for securing the tubing when submerged in a body of water;
• wherein said lower portion has a cross-sectional shape with generally flat sidewalls and a generally flat bottom wall extending between the sidewalls.