I vaguely remember seeing a recommendation that on the outlet side of the pool pump (mine is a 1 1/2 HP Pentair Challenger) that at least an 18" straight piece of cast iron pipe be installed before a union before continueing on to other plumbing. I have developed a leak at the outlet of the pump where it connects to the 2" PVC. Should I add this piece of cast iron pipe or simply try to fix the leak using teflon tape or Magic lube? It sounds like Permatex is better but I doubt if I could find it here in Mexico.