An ecologically friendly way of improving the water quality in dams and lacs
The Kosuijin uses pumped air to create a convection movement in the water. This movement allows for the surface layer of the water to be directed downward while simultaneously sending to the surface the bottom layer of the water.
The mixing provided by the Kosuijin not only brings oxygen to the bottom layer of the water but also prevents blue-green algae bloom from occurring.
Thanks to Kosuijin, it is possible to avoid algae blooms without the use of chemicals!
Improve the water quality and respecting the environment
The Kosuijin doesn’t need any chemicals to be efficient and require only a small amount of energy to function.
Maintenance free !
The underwater equipment has a simple structure with few moving parts making it very reliable and thus reducing maintenance related costs.
In harmony with the landscape
Only an air compressor is necessary for the Kosuijin to function thus the water quality is improved without sacrificing the beauty of the surrounding landscape.
Creating a downward current to improve the water quality
Air is ejected from the Kosuijin, generating an updraft which drives a convection like movement of water. This movement of water brings the surface water, rich in O2, to the bottom thus eliminating anoxic condition in the lower layers of the lac and improving the overall quality of the water.
The main advantages of the Kosuijin
- Circulate the water across all the water columns thanks to, a worldwide exclusive, system creating a three dimensional flow in the water.
- Send the oxygen rich surface water to the bottom with a downward flow and suppress the elution of nitrogen and phosphorus.
- The movement created by the Kosuijin inhibits the proliferation of blue-green algae and suppresses the occurrence of algal bloom.
- With the increased oxygen level in the bottom layer of the water, increase the number of benthic organisms and regain clean water appearance thanks to them decomposing organic water.
Example of water quality improvement
–Kasegawa Dam, Minamishimabara City, Nagasaki Prefecture
Effective water storage capacity: 119,000 m3
Effective water depth: 5.2m
Equipement: Kosuijin Type 3K
Available storage capacity: 119,000㎡ Net depth：5.2m
After installation, water temperature and the dissolved hydrogen were measured at each depth. The water temperature and the dissolved oxygen level have been kept constant regardless of the depth of the water after the installation of Kosuijin, regardress of that depth of water.