Most water features, with life in them or not, require some form of filtration to maintain or improve water quality. Filter modes run the full gamut of simple particulate strainers intended to keep solids out of the pump, to computer-monitored systems with meters and dosers. This is a brief overview describing modes of filtration for waterscapes.

You will find there is a plethora of various, sometimes conflicting opinions regarding the best available, most appropriate mode for a given application. Unfortunately, to my knowledge, there are no comprehensive reference works that could provide you with one source of state of the art information. In my opinion you should do your bst to educate yourself as to the choices that make most sense. This is best done, surprise (!) by reading such works as the one in your hands… but there are many more.

Outside of books, there are many othr sources of information (magazines, the Internet) that promote various manufacturers' wares, and perspectives. Depending on whether the system at hand is intended to be sterile or biological; balanced with plant and animal life and no circulation; have influent water from determinant source(s); be indoors or out; be crystal clear or tolerably murky; ad seeming nauseum, there are a spectrum of biological, physical/mechanical, chemical filters to consider.

If it seems the best I can do is commiserate with you over the state of affairs in our industry at present, be aware; I intend to do much more. The following Sections will give you a firm beginning as to the theory and current best practices for maintaining your system in the way of filter design, construction and maintenance. For biological systems this will be a concise guide to options per all given sets of circumstances.

Do not despair at the disparate and conflicting opinions regarding filtration amongst writers, retailers, contractors and hobbyists. Remember, a great deal of water gardening is art as well as science; keep in mind this difference when appraising the anecdotal information you come across.