Sentences describing dirty water

I only remember that there used to be a crystal clear lake here, but now-even if the sun shines on the water, I can only see the dark lake and nothing else. I moved my nose forward, but immediately I took a step back. The smell of the lake was pungent, and the smell of feces and rotten fruit flooded into my nostrils. A touch of white in the distance attracted my attention. I'm really glad that there is such pure white in this lake, but