Thanks for the reply. I'll repost in the future when we remodel. I'm going to have to address finding out why the main drain isn't being used and adding more return lines. Only have one now. Also replacing that filter box with a new skimmer. Once the pool is drained we can start looking at the plumbing. I suspect that it still original under the pool. No idea what they used back then.. Iron pipe? The house plumbing is a combo or iron and copper pipe.