So I hired the remodel Pool Company and with the refurbishment I had two skimmers replaced. The contractor poured the concrete around paper bags which hugged the skimmers. Will this cause leaks in the future? The concrete subcontractor said initially they are put there on purpose to hold the cement in place while it hardens and will be removed before they add the hydraulic cement that keeps it from leaking. I did a little research and typically they use a mold to hold he concrete in place or a burlap bag (not a paper bag). Should I be concerned?