A "bacteria bed" (also known as a trickling filter) is used to expose sewage effluent to air and microorganisms to purify the water . Which perspective are you most interested in?
These systems create a large surface area for "good" bacteria to thrive. These bacteria neutralize toxic ammonia from fish waste into harmless compounds . bacteria bed
at 60°C or higher to effectively kill bacteria . A "bacteria bed" (also known as a trickling