I am getting a new liner and considering adding an extra return on the opposite side of the pool. (Its a 33' round pool and the single return is beside the skimmer. I can do the plumbing myself, just wondering if it is worth the extra trouble for the added circulation. I am also wondering if I should be concerned about the new return rusting out, since it would be installed in a steel section of the pool wall (the pool has an aluminum panel for the original skimmer and return) Has anyone had trouble with rusty returns in steel walls?