This pond has been a nightmare. This is my first pond, I figured if I read up on ponds it would be enough to get me through my first pond. The skimmer had been leaking where it meets up to the liner from day one. The first time I put it together I used no silicone - Leaked. The second time I put it together I used silicone - Leaked The third time I put it together I siliconed it like crazy - Leaked The 4th time I put it together I siliconed it, and I made a gasket for each side of the liner - Leaked Now what? I think all my problems began with using an inferior liner. The customer had a liner that he wanted to use, so we used it. The package said it had a 25 year warranty. I am also matching this up to a Savio skimmer, which does not include a gasket. It is the cs0000 model I beleive. Looking at the 2 liners there is a considerable difference in thickness. The liner I have is more rubbery and less plastic like. It is at least twice the thickness. Do I need to replace the liner? If so where do I seam it, right beneath the waterfall?