I have an inground pool with a significant leak. Through process of elimination and the red food coloring test, I've identified the two sources. They are the pump lines that return water back to the pool. I have have removed my deck boardin and dug enough around them to confirm these are the sources. Now, my question is on how to repair. I have done a lot of work with sprinkler systems PVC (cutting, adding a coupling, gluing, etc.). However, the elbow on one of these lines is so close to the concrete pool wall, I'm not sure I can remove the cracked elbow and replace the piping. Is it possible to remove the entire line from the pool wall?

I've heard of heating the hot tub with gas. can anyone explain the set up or refer me to a place I can learn about it please?