His Majesty, he is aware of this kind of pollution condition of mixture is thanop. On April 15 and April 20, 1937 2528 (1985), together with other agencies to improve the Lake as well as makkasan catchment. Aid in drainage in the rainy season and to alleviate its waste water in the Canal, Sam by the Royal instructions, use the water hyacinth, water damage. Which is called natural water filtration is water hyacinth weed, which is available to serve as an impurity and absorbing toxins from polluted water sources and at the same time, they must regularly take water hyacinth from the Lake every 10 weeks.
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