I have a 30,000 gal gunite pool with 2 threadless 1/2” return lines. My TA number is 120 and the suggestion is to reduce pH with acid and then aerate. How do I aerate if my return lines aren’t threaded? There are holes drilled in the plaster where the return lines are at about a 45 degree angle. I’ve put my finger in there to try and feel pvc, but i can’t get far enough back to feel it with my finger. Any suggestions on how to get a fountain hooked up to this beast?