Evolution Aqua manufactures stellar filtration systems that dramatically improve a pond’s water clarity level. A great example is the Nexus Filtration System. The Air Ring Complete Nexus 200 is an important component of the Eazy Main Body. The equipment that it is part of is responsible for creating cleaner ponds, thus providing a healthier environment for your koi. At Everything Koi, you can purchase Air Ring Complete Nexus 200 at the most competitive rates.