I think we are talking about the same stuff. Take a clear glass jar and take a sample of the water and you will clearly see many little brownish "dots" suspended in the water. THAT is Gloeotrichia. It has appeared every August as long as we've been coming up here. Apparently, from what I've read and been told, it is always in the water, but it lies dormant on the bottom until the temperature and sunlight conditions are right for it to bloom. It's okay to swim as long as it is not too concentrated (shallow coves where it is so thick that it floats on the surface) but it's not okay for humans and pets to drink water where there is an active Gloeotrichia bloom.
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