The wastewater flows through the side of the filter to make contact with the waste water is treated on the surface of the filter and the roots of plants beneath the filter is saturated with water at all times.
The wastewater flows through the sides of the filter to make the waste water was treated during the facial filters and best filtering layer under the roots of a plant are saturated with water at any time.
The wastewater flows through the side of the filter to make wastewater treatment has been in contact with your skin during the filters and the area under the roots of the plant floor filter is saturated with water.