Use air tubing for pond aeration systems. We have weighted tubing which sinks to the bottom of the pond and we have poly tubing which floats. Weighted tubing has the benefit that it sinks and is out of view. It is more expensive. Poly tubing can be more economical to use and can be weighted every ten feet or so with a zip tie and fire bricks that have holes in them. Poly tubing can also be installed in the ground and go from a compressor, which may be in a garage nearby, to the air diffuser assembly located at the pond's edge where one may choose to have weighted tubing within the pond. Regardless, we have many different types of air tubing (commonly called air hose) to choose from with different lengths and diameters available.