An area for planting garden plants that like extremely wet soil-either vcry damp or with standing water. Often created by putting a liner in a shallow depression in the ground and filling with soil and planting.
A term sometimes used to describe a pre formed rigid liner waterfall unit. Often contains a biological filter ( usually plastic media halls or stones in a mesh bag).
Any filter that uses beneficia bacteria to convert toxic chemicals in the water (usually ammonia from fish waste) into benign substances. There are many different designs using many different bacteria and materials.