I just wanted to give a big thumbs up for Frankenplugs for solving pool leaks in returns. (https://www.amazon.com/s?k=frankenplug&crid=1VV61J9Y6W1AR&sprefix=frankenplug,aps,75&ref=nb_sb_noss_2)
My fiberglass pool had been losing about an 1" every other day all summer. I bought a leak detection kit (syringe and ink) and tested all my openings and I was able to isolate it to one of the returns. I shut that return off in the pump house and installed a plug in the return and was able to confirm that the leak was somewhere in that system. I looked into a number of solutions to try and fix it including a liquid called fix a leak as well as companies that shoot an epoxy through that return line to seal the leak. I called one company that was certified for doing these epoxy repairs and the person who I talked to about it told me that he has seen a lot of leaks in pools and from what he has seen the issue is almost always a crack in the area of one of the threads in the return where you screw in the return eyelet. I purchased a Frankenplug and installed it in that return and PROBLEM SOLVED! I ended up using the Frankenplug mini. They are very easy to install work like a champ if your issue is near the opening are of the return.
My fiberglass pool had been losing about an 1" every other day all summer. I bought a leak detection kit (syringe and ink) and tested all my openings and I was able to isolate it to one of the returns. I shut that return off in the pump house and installed a plug in the return and was able to confirm that the leak was somewhere in that system. I looked into a number of solutions to try and fix it including a liquid called fix a leak as well as companies that shoot an epoxy through that return line to seal the leak. I called one company that was certified for doing these epoxy repairs and the person who I talked to about it told me that he has seen a lot of leaks in pools and from what he has seen the issue is almost always a crack in the area of one of the threads in the return where you screw in the return eyelet. I purchased a Frankenplug and installed it in that return and PROBLEM SOLVED! I ended up using the Frankenplug mini. They are very easy to install work like a champ if your issue is near the opening are of the return.