Hi guys I'm currently remodeling my 20,000 gallon pool. I have 3 return lines in the pool, after doing some trenching today for my sheer descents I found the return the lines. All three returns are being run off of one 1" pool line, the strange part about it is the line is only 1", is this normal? The pool was made in 1987. I was thinking about biting the bullet and installing all new 2" return lines. What would you guys recommend?