The second part is the part that is floating on the surface of the water plant species, including a small plant hanging floating in the water.The second part of this area, there will be no planting with na lat high pop out of the water as in the first part and third part. In this section it is to touch the air and the sunlight makes the growth of algae, which increases the oxygen causes microorganisms soluble type that uses oxygen degrade soluble organic compounds decreases the value b o d in waste water.
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