filtration bed in a sentence

1. The powder is added to the beer and recirculated past screens to form a filtration bed.
2. Kieselguhr, a fine powder of diatomaceous earth, can be introduced into the beer and circulated through screens to form a filtration bed.
3. Some methods involve filtration media such as sheets or candles, while others use a fine powder made of, for example, diatomaceous earth, also called kieselguhr, which is introduced into the beer and recirculated past screens to form a filtration bed.
4. It's difficult to find filtration bed in a sentence.