ประกอบด้วยร่องยาวหรือพื้นดินที่เคลื

Long furrows or consists of ground coated or impregnated with a waterproof material below. To prevent water leakage and filters to allow the plants to grow crops and adhesion. Filter may be used as a rock.This system is suitable for wastewater with BOD load in the range of 30-175 mg / l.

Contains a long Groove or ground coating tinting materials waterproof below. In order to prevent the leakage of water and the filter plant to help make the adhesion and growth of plants. The filter is used, it might be rock. This system is suitable for waste water owe b o d range 30-175 mg/l.

Includes a long groove or land that is coated or plastered with water resistant materials at the bottom to prevent leakage of the water and the filter to help plant and plant growth can be traction. filter may be used as a stone.This system is suitable for wastewater burden BOI is good in the range of 30 - 175 mg/L