I just bought a 30 years old house with a pool. It works. The pump looks old and the sun has destroyed the tag the would tell me the hp . It is running about 6 hours a day. The plumbing is 1 1/2”. I’m guessing it is 1 1/2 hp from looking on line. Are new pumps much more efficient than older ones or is it all about the same? The pool has renently been resurfaces and it looks great but the filter, and pump look many years old.