I currently have a 100'x2" blue discharge hose running across my back yard for backwashing the filter. I want to bury a permanent hose. The yard has a constant slope, so it will drain to avoid freezing. What kind of hose should I use? I was looking for 2" poly tubing, but the internet isn't turning up much. I thought about PVC, but it would be alot easier to unroll 100' of continuous hose and dig a ditch for it (or rent a ditch witch...) rather than glue together 10, 10' sections. I also found 2" suction hose, which is reinforced so it doesn't collapse. Tractor supply has it for $2.19 a foot, so $219 for 100....