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Sure is.

Yes, I am.
It's so much crystal-clear that you can see the bottom of the lake.
per second this lake emitted 1400 litre crystal-clear water.

The lakes around here are so muddy looking. I wish they were clear I would swim in there and explore.

you are looking at the bottom of the lake.
That's why you are seeing muddy.
It's totally crystal-clear water.