A regeneration zone is the name for the active ecosystem used to keep your pool clean and healthy. This is often an adjacent 1:1 sized pool filled with plants, animals, bacteria, and other microbes that balance nutrient levels within the water, as well as absorb unwanted chemicals. Water is constantly circulating between the swimming and regeneration zones.
The regeneration zone serves the role of disinfector and filter within a natural swimming pond. Taking the place of chemicals like chlorine.