The principle of the trickling filter method is to pass sewage through a layer of ventilated gravel, allowing bacteria attached to the gravel to decompose the organic matter in the sewage
The principle of trickling filter is to pass the sewage through the permeable gravel layer, and let the bacteria attached on the gravel decompose the organic matter in the sewage<br>
The principle of drip filter method is to pass sewage through the breathable gravel layer, allowing bacteria attached to the gravel. Break down organic matter in sewage