A natural swimming pond stays clean through biological filtration, aquatic plants, and proper circulation. The regeneration zone, filled with gravel and carefully selected plants, absorbs excess nutrients and prevents algae growth by competing for resources. Beneficial bacteria break down organic matter, keeping the water clear and balanced.
A gentle water circulation system, often using a small pump or gravity flow, helps distribute oxygen and nutrients while preventing stagnation. Regular maintenance, such as removing debris and trimming plants, ensures the ecosystem remains in balance. Introducing snails, frogs, and certain fish can aid in controlling algae and other unwanted growth.