I am new to the pond business. I moved to a house that has a pond . I am in the process of cleaning and setting it up the right way. It has Koi already in it. The unique part of my pond is that it comes into my house about 5 feet. I am going to have to take the system a part and set up a natural system. I need to also put rocks or gravel in the bottom. I am excited to get started. I have 5 children that can help me.