Thanks for the help Carl! Here is all the info I have been able to collect about the pool. Again my dad was the man who knew everything about it so if I have missed anything just let me know and I will try to find out for you.

The system: A Hayward Perflex EC-75 with a Super Pump of unknown HP.

The pool: 20 feet wide x 40 feet long, 3 feet deep in the shallow end and 10 feet deep at the deep end. In ground, vinyl liner, I have heard estimates that it is about 40,000 gallons but I do not know that for sure.

The plumbing: The outer diameter of the piping I see is 5 3/4" in circumference, so I calculate it is 1.83" in outer diameter and I ASSUME it is 1.5" inner diameter. I estimate the length of pipe (underground so I cannot directly measure it) is 52 feet on the return line and 36 feet on the skimmer line. There is one more line, a submerged intake in the deep end but we never use it (this is roughly 15 feet from the pump).

I know it is hard to determine what kind of pump is needed, but any help is much appreciated because we don't have a lot of money. I would really like to get the right pump and not have to worry about it in the future.

Many thanks,
Bob Jersey