We have been using TRM DI pipe from PNP Supply for our snowmaking system since 2007. Its advantages include working pressures above 750 psi and a lifespan that is 3.5 times longer than steel, depending on soil corrosivity. Before we started using TRM DI pipe, we had steel pipe rust and fail after as little as 12 years, and hope never to invest time and money putting any pipe in the ground that has a shorter lifespan than TRM DI pipe.