"In very clear lakes with low amount of dissolved organic matter suck as portions of the Great Lakes or high mountain lakes, UV can penetrate relatively deep. In Crater Lake. Oregon, one of the clearest lakes known to exist, UV can penetrate over 300 feet deep. In lakes with high dissolved dissolved organic matter, it may penetrate less than a foot. Only a small amount of organic matter is needed to absorb UV rays." Dr. Rob Neumann Vol 40 N. 7 "In-Fisherman" Rick
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