I am going to pull my submersible pump to install a CSV at the pitless adaptor. While I am at it, I will lower the pump to 5' from the bottom of the well to increase gpm output. It is now 10' from the bottom. I plan to replace the 60' Polyethylene downpipe rather than just add a 5'piece. What advise can you offer about attaching the poly pipe to the fittings at the Pump and at the Pitless adaptor? Are there differences in Poly pipe or can I use the coiled type sold at Lowes?