Pondmaster® Filtration Systems are small pond filters designed to stay hidden in the bottom of the pond or water garden. These submersible pond filters are mainly for mechanical filtration, but larger sizes also include chemical and biological filter media. Large filter area means less frequent cleaning. More than one filter can be connected to a pump using a tee fitting. Dual filter elements offer particle filtering and chemical filtration of certain harmful compounds and unwanted colors. The filter media is easily rinsed or changed, less time consuming than many other filters of this kind.