The main thing you want to do is keep the airline at a slight down grade so water condensation does not collect in valleys of the tubing and freeze a plug in the airline. Some may think that for northern extreme winter conditions it my be better to have a short airline run to the pond to reduce chance airline freeze up. It is debatable - pros & cons. Other northern pondowners may weigh in on this. For your application use 1/2" or 3/4" ID black irrigation pipe (Lowes, Home Depot, many local hardware stores). The 3/4" is less likely to have frozen water plugs due to larger ID. When you get to the pond then use weighted hose.
http://www.homedepot.com/p/Advanced-Drai...78#.UhUOherD86Uhttp://www.lowes.com/pd_248743-13598-061010P_0__?productId=3136515&Ntt=plastic+water+irrigation+pipe&pl=1¤tURL=%3FNtt%3Dplastic%2Bwater%2Birrigation%2Bpipe&facetInfo=
Great information. Thank you Bill.
Another thought: If I want to run 2 separate diffusers (as has recently been suggested to me), then I am looking at double the airline cost, correct? At some point, does it become more cost effective to run power to the pond, instead of running air hose to the pond, even taking into consideration the additional wear and tear on the pump by it being outside, albeit housed properly?
Again, much thanks.
