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The foam actually contains dissolved organic compounds, and cool temps, splashing, and salt can all cause more foam to form. A protein skimmer is an alternative to massive water changes, as it encourages foam to form, which contains the DOC's, but them also removes the foam from your pond, and the DOC's in the process, without removing (much) water from your pond.
Google search for protein skimmers or foam fractionators or go to your local aquarium store to learn more. Since salt increases foam (as someone pointed out earlier, although as someone else pointed out, your problem is dissolved organic compounds), saltwater aquarists use these devices to remove foam. Your regular pond skimmer should also help pull it from the water surface and you can scoop the foam out of your skimmer. But that is more passive and a protein skimmer is more active.
Google "dissolved organic compounds" (perhaps with "pond" or "koi" to narrow results) to learn more.
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