Why use external filters in a pond environment?
In a natural setting, a pond will typically have an inflow of fresh, oxygenated water from a stream source, and a constant outflow of “dirty” water to a downstream outlet. Your fish pond, however, is a closed environment that constantly re-circulates the water volume in your pond. Therefore, you need to maintain a balance of nutrient-creating pond life – your fish – and nutrient-consuming pond life – your plants and beneficial bacteria colony – to keep your pond’s ecosystem healthy. While it is certainly possible to maintain the balance of your pond’s ecosystem between plant and fish life, no two ponds – or pond owners – are exactly identical.
