My 1.25" black poly pipe has been in the water for 21 years and has never failed. I have a drain down by the water line that I open to get most of the water out. I do have about 25 feet of 1.5" poly pipe over the smaller pipe where it enters the water. This protects the inner pipe from wear against rocks. The outer pipe gets badly rubbed but the inner pipe has always been ok.
I am at the northern point of Bear Island where we get a lot of ice action.
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