muddy

In these muddy dwellings, the nymphs use their abdominal gills to accelerate water through their burrow, filtering it for food along the way.

Psychologists call this phenomenon the overjustification effect— the idea that additional extrinsic motivators can actually muddy the waters when you already have the intrinsic drive to do something.

We need to go into that pond that's all gross and nasty and fill it up with muddy water, can you do that?

About a year ago, I read about this powder you could add to super muddy water like this, and then you stir it up, and five minutes later, the mud has separated from the pure, clean, drinkable water.