photosynthesis according to the present research it is newly discovered that the algae and diatoms are absorbing the insoluble organic substances in the wastewater while the algae and diatoms are photosynthesizing with nitrogen and carbonate it is also verified that more than 95 of the dissolyable organic substances known as humic acid are consumed as the algae and diatoms grow the humic acid is a residue that is left over after the bacteria and fungi have decomposed the dissolyed organic matters in the wastewater over a long period of time the residues of the sewage animal excreta and human bowel movement are the remaining insoluble organic matter after decomposition by the bacteria or fungi for a long time through the present research it is discovered that the algae and diatoms have the capability to absorb the residues that remain after the bacteria and fungi have decomposed the dissolyed organic matters in the wastewater this discovery is applied to the new concept of treatment however this concept extends the current understanding that organic matter is decomposed by the bacteria and fungi by virtue of the present discovery it becomes possible to employ algae and diatoms to effectively decompose the insoluble organic substances in wastewater the treating process is as follows the sewage water or wastewater flows down through a series of multi stage filtering tanks which contain transplanted algae and diatoms along with filtering materials it will take 5 to 7 days to fully grow the transplanted algae and diatoms each filtering tank has a compartment wall to sequentially over flow the wastewater along the flow stream there are several different kinds of algae and diatoms being cultivated depending on the concentration of.