Great. Thanks. I won't touch that old line.

Concerning Number 2 though. Talked to the pool store. They said it sounds like I have 2 return lines. His advice was to always leave it set on 1/2 which uses both lines. One thing I forgot to ask though:

If I have 2 return lines, does that mean I should 3 holes in the pool that requires the eye ball fittings? One that sucks water and 2 that send filtered water into the pool? Because I can only find 2 holes in the pool. Otherwise, where does that additional pipe go to?