What is a pond filter?
A pond filter is a container which is filled with material called media. This media does two or three things: a) traps small particles of waste matter (Mechanical filtration) b) provides a large surface area which is colonised by a bacterium which consumes waste (Bacteriological filtration) c) absorbs or converts other toxins which cannot be trapped or converted by a) or b) above (Chemical filtration). Most filters are supplied complete when purchased with a) and b) and the option for c) may be purchased separately. Fitting a biological filter means that the quality of pond water is greatly improved. However, it will not guarantee complete water clarity at all times unless it is used together with an ultra-violet steriliser. This combination guarantees crystal clear water. Biological pond filters must be run 24 hours a day from mid March/April until end September/mid October (UK Calendar) when they can be disconnected, stripped and cleaned for the following Spring season. You will need
