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I did a little research and found that the foam is caused by dissolved organic compounds, (sometimes referred to as DOC). Often times it is caused by phosphate but also proteins and amino acids are also common causes. Did you wash the pond liner, anything else with soap or possibly the pond liner was contaminated with a detergent from the supplier? Maybe it came from the deck material? Manually remove as much as you easily can and mechanical filtration should get most of it and @Meyer Jordan can chime in here please, but I believe that once the bacteria get established they will help to process it. I might be a little concerned of contaminating any plastic or ceramic type of biological media, stone I wouldn't worry much about. I've seen it often where water exits into culverts, it is also present when making stock (cooking). Chef's skim it off with a large spoon and protein skimmers remove it in marine aquariums.