Surface Film on Lake

Question: What is a surface film on a pond or lake?

Answer: Well, generally the surface film is created by high surface tension on the water. What is actually floating on the top can be anything from general organics, dust, pollen. What we see more commonly on the surface is an algae type called euglena. Euglena has kind of a reddish-brown dusty kind of a look to it and it appears like just a film across the surface.

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