His Majesty the king realized pollution. Therefore, HRH Princess Maha Chakri Sirindhorn on 15th April, and on 20th April๒๕๒๘ to various agencies together to improve wetland Makkasan to use as a water storage facility Assist in the drainage in rainy season and relieve the wastewater in the canal of the given advice. Make use of water hyacinth filter wastewater.Which is called the water nature is the use of water hyacinth, which is existing weeds. To absorbent filth. And toxins from water pollution. And at the same time, also need to keep the water hyacinth from marshes every 10 weeks