How do you prevent your fish from dying? How do you prevent dirty polluted pond water? How do you avoid mosquito breeding grounds? How do you create conditions that favour the myriad of beautiful creatures that inhabit ponds? It's simple. You get the benefits of clean and healthy water by installing a biofilter. Would you like to know how to build your own biofilter for a few $? Or if you already have one would you like to increase its capacity for less than a couple of dollars? As fish grow more biological capacity is required to cope with the extra load. Learn how easy it is .... once you understand and know how. We have saved thousands of people agony and money over the years with basic straight forward reliable advice.