A natural swim pond is a chemical free pool with a natural aquatic plant filtration system to remove contaminants. The water garden of plants like cala lilies and cannas, horsetails, lotuses and grasses deprives would-be algae of nutrients and attracts friendly insects to manage pesky mosquitoes. Rocks attract beneficial bacteria. The plant garden is separated from the swimming area by a retention wall.
|My sketch of the system. A pump, swim area, and plant regeneration zone, which incorporates plants and rocks behind a wall separating the swim area from the regeneration zone.|
While still benefiting from avoiding the chemicals, an alternative gravel filter can be used instead of the plant garden. This allows you to replicate the appearance of a traditional pool, if that is your preference.
According to Houselogic, the costs of construction are comparable to traditional pools, but without the maintenance expenses required for chemical care.