Hi, I have the same problem, or even worse. House built in early 80s. Only one return inlet, and it looks like a one inch nonthreaded pipe, and worse, it doesn't come straight out into the pool, but is cut at an angle ... a very severe angle.
Wondering if the kit worked. It looks discontinued so I have to grab one soon. Huge pollen/leave problem in my pool due to trees in my own yard and neighbors.