Back story :
Back in 2011 i had solar installed for the pool. Due to inexperience and extra water going to the solar, there were times when the pump would start running dry and i would only catch it once i got home from work. At about the same time a leak started forming at the threaded pump output. I had the solar company come out and fix the issue, but they said that it was starting to leak because, When the pump runs dry, the area heats up and weakens the threaded joint. After a second and final repair, they termed it a "last ditch effort" ( seen in the pics) they were no longer covering the repair. For the repair they put in the dark grey threaded pipe which prior to this was a standard threaded pvc adapter.
The joint is currently leaking a small stream of water. I can lose a few inches of water a month which does not allow for the skimmer and vacuum. I finally want to get around to trying to fix this. What would be some simple things to try before getting into more expensive options? What are the more expensive options? I just replaced the motor within the last year or two, so would a housing replacement be next up? I read about someone using galvanized iron pipe for this, but i am not sure how well that would work due to corrosion. What mating options do i have if the outlet pipe will need to be permanently attached to the pump housing?