I know Ewest knows this, as do most regulars. However, just a reminder to new readers that dissolved oxygen saturation changes with water temperature. Colder water has a higher level of dissolved oxygen saturation. Speaking very generaly, when Dwight's water is about 75 F, oxygen saturation is about 8.5 parts per million. At 45 F, saturation is about 12 ppm.

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From Bob Lusk: Dr. Dave Willis passed away January 13, 2014. He continues to be a key part of our Pond Boss family...and always will be.