Maintenance of a natural swimming pool differs from traditional pools due to the absence of chemicals. However, regular upkeep is still necessary to keep the pool clean and in good condition. This involves weekly tasks such as emptying skimmer baskets, removing debris from the water’s surface, and vacuuming the pool floor using a pool cleaner. If any algae grows in the swimming area, it can be safely eliminated by brushing, vacuuming, or using a robotic pool cleaner. In the case of new constructions, an in-floor pool cleaner can be installed.
In addition to the pool maintenance, attention must be given to the water garden in a natural swimming pool. Throughout the growing season, plants need to be trimmed and pruned, and organic debris should be removed from the water to minimize the nutrient load on the aquatic ecosystem.
For natural swimming pools located in cold climates, winterization is required to prevent damage. This involves blowing out the plumbing lines and plugging the returns to prevent water from re-entering the pipes and freezing. Instead of using winterizing chemicals, plant maintenance is necessary. Perennial aquatic plants should be cut back to allow for regrowth in the following spring. Some replanting might be required when reopening the natural swimming pool.
Unlike traditional pools that require consistent physical labor and financial costs for maintenance, natural swimming pools operate differently. In the case of natural pools, the cleaning process is facilitated by the plants, microbes, and algae present in the ecosystem, making the maintenance effort more front-loaded. Establishing a new ecosystem requires patience and attention during the initial weeks, as the plants need time to grow and the beneficial bacteria need to establish themselves in the biological filter. As the plants and ecosystem develop, the maintenance required for the natural swimming pool decreases, as they contribute to keeping the pool clean and suitable for swimming.
Chemicals are not required for natural swimming pools due to the design approach. These pools typically utilize “one pot” or “two pot” designs to eliminate the need for chemicals. In a “two pot” design, the pool is divided into a constructed wetland called the regeneration zone and a separate swimming area. The two zones may be separated by a dividing wall, and water movement is facilitated by filters, pumps, and plumbing. Biological filters are employed in natural swimming pools to promote the growth of biofilm and beneficial bacteria that reduce phosphates and out-compete harmful bacteria. The water circulates between the regeneration zone and swimming area, preventing the accumulation of unwanted substances in the swimming area. The continuous motion of the water aids in filtration, eliminating the need for harmful chemicals in the pool.
The care of plants is vital in natural swimming pools. Three types of plants are typically included: floating plants (such as water lilies), emergent plants (such as sedges and rushes), and submerged plants (such as hornwort, which oxygenates the water). Similar to gardening, plants in a natural swimming pool require regular care, including trimming, replacing, and ensuring their overall health. The effectiveness of the bio-filter in maintaining water quality depends on the proper care of the plants.
Floating plants come in various types, including submersed, free-floating, and trailing floating. Submersed floating plants have roots anchored to the bottom of the pool, with leaves and flowers growing and floating on the water surface. Free-floating plants are suspended on the water and can be moved by wind and water currents. Without proper care, free-floating plants can overgrow and dominate the natural swimming pool. Examples of floating plants include Water Hyacinth, Water Lettuce, and various flowering plants.
Emergent plants are crucial components of natural swimming pools, as they are rooted in the pool’s bottom, with leaves and stems extending out of the water. These plants stand upright in the water due to their sturdy stems and contribute
to the biodiversity of the regeneration zone. Lotus, Arrowhead, Pickerelweed, Iris, Sweetflag, Carex, and Juncus are among the recommended emergent plants for natural swimming pools.
Submerged plants, also known as underwater plants, are fully submerged and rooted at the bottom, relying on the water for support. Similar to other plants in natural swimming pools, submerged plants require maintenance to maintain their aesthetic appeal. Examples of submerged plants suitable for natural swimming pools include Hornwort and Potamogeton.
While chemicals are unnecessary for cleaning a natural swimming pool, several essential items are still required. These include a pool or pond vacuum for cleaning the pool bottom, as algae growth or debris accumulation may occur. Built-in floor cleaners are also available as an option to reduce maintenance time. Additionally, every pool owner should have a skimmer to remove leaves, debris, and unwanted materials that can disrupt the pH levels and introduce unwanted phosphates to the water. However, the physical labor involved in maintaining a natural swimming pool is significantly reduced compared to traditional pools, as the plants and microbes play a significant role in cleaning, replacing the need for chemicals.
In terms of winter maintenance, natural swimming pools offer more flexibility and functionality compared to traditional pools. In winter, the pool freezes and can be used as an ice skating rink. Prior to extremely cold temperatures, it is necessary to drain the pump and blow out the plumbing. The same applies to pressurized filters, if used. Different plants in the natural swimming pool have varying winterizing requirements. Hardy plants and water lilies can survive freezing temperatures, while marginally hardy and tropical plants cannot. It is also advisable to shut down waterfalls before freezing temperatures to prevent inadvertent drainage of the water from the pond. Despite these tasks, winterizing a natural swimming pool is a straightforward process that safeguards the pool from winter damage, ensuring it is ready to be used regardless of the external temperature.
