Rod Ingersoll shows in detail how he designed and built a home made biological filter to accompany his new fish pond. Further information can be found at www.diykoipond.com. The filter was designed to replicate a natural wetland type system and should allow for optimum fish and plant conditions. In this filter Rod creates an aerobic system that will breakdown fish waste (Ammonia) and convert it to nitrate for plants and will allow more fish to be kept in the pond. The bio filtration system after a few weeks will aid good bacteria to grow on the filter medium for great fish health. The system was built and tested thoroughly in about 3 hrs and should require very little maintenance at all. This Bio mechanical water filtration system is for Koi, fish ponds, and water gardens but could be just as easily applied to other situations. Its simple to setup & run. All up it cost approximately AU $100 to build. I must say that i did get a great deal of knowledge from the following DIY koi fish pond ebooks and bonus downloads. They taught me loads of great tips and tricks i needed to help me along the way building and designing my pond and filter system. Im sure it will also help you too: www.diykoipond.com