Transforming a pond into a natural swimming pool is feasible with the right modifications.
In the heart of many British gardens lies a forgotten pond, a tranquil oasis that could be transformed into a chemical-free, ecologically attractive swimming area. Converting an existing garden pond into a natural swimming pool is a popular choice for those seeking a more sustainable and natural swimming experience.
The process begins with understanding how you want to use the pond, as this will guide many of the design decisions, from the size of the swimming area to the types of features and planting around it.
One of the biggest financial advantages in a conversion tends to come from reduced spoil removal. Almost any pond can be converted, as long as it's possible to divert and control the existing water source.
A bespoke freshwater pool typically ranges between £80,000 and £150,000, depending on size, materials, and optional extras. However, costs can be significantly lower if DIY techniques and local plants are used.
Working with someone experienced in conversions is recommended, as existing ponds can have hidden challenges. Loren Taylor, landscaping expert and founder of Soothing Company, is known for his refined approach to exterior design and has spent the past 17 years transforming outdoor spaces into calm, well-balanced environments that blend beauty with functionality.
Natural swimming pools rely on biological filtration rather than chemicals. This often involves adding wetland plants either floating or in constructed wetlands around or inside the pond to naturally filter and oxygenate the water. Incorporating a bog filter or constructed wetland area is common.
The water in a natural swimming pool is filtered through a gravel bed that removes phosphates and keeps nutrient levels low, maintaining clear, clean water. However, existing organic matter in an older pond can overwhelm a new filtration system if not properly managed, and poor circulation may lead to stagnant water.
The pond may require reshaping areas with shallow zones for plants and deeper zones for swimming, ensuring safe access with steps and non-slippery surfaces. Overhanging trees or branches above the swimming area should be avoided as they can drop organic matter into the water and increase maintenance.
Maintaining constant water movement is critical to avoid stagnation and prevent mosquito larvae breeding. Natural pools typically have good dissolved oxygen levels thanks to plants and circulation, keeping pests in check.
Aquatic plants can be retained and reused in the conversion process, replanted into a low-nutrient substrate. A small, solar-powered circulation system can help aquatic plants adjust to the new balance and lower energy costs.
Natural swimming ponds may need minor seasonal adjustments such as clearing debris or managing plant growth but generally have lower maintenance than chemical pools. Biofilm buildup can create slippery surfaces on steps and edges, so these require regular cleaning or safety treatments.
In summary, converting your garden pond into a natural swimming pool requires ensuring control over water source and flow, installing biological filtration typically via wetlands or bog filters, potentially redesigning parts of the pond for safe swimming, and committing to ecological maintenance. The cost and timeline for converting an existing garden pond into a swimming pond are generally similar to building a new natural swimming pool from scratch.
Melinda La Mantia, Head of Design at Gartenart Swimming Ponds, has over 15 years of experience in the UK, Italy, and Spain. Many clients have done so with Gartenart, converting an unloved pond into a swimming pond that can create a visually stunning feature that can be used and enjoyed daily in warmer months by the whole family. A freshwater natural pool uses mineral filtration systems to maintain clear water with minimal upkeep, and no need for standard swimming pool chemicals.
- The design of a natural swimming pool should be guided by your intended use of the pond, considering factors like size and features.
- Reduced costs in a pond conversion often stem from lower spoil removal expenses, and almost any pond can be converted, given proper water control.
- A bespoke freshwater pool typically costs between £80,000 and £150,000, but costs can be decreased with DIY techniques and local plants.
- Working with an experienced professional like Loren Taylor, who specializes in exterior design and eco-friendly transformation, is advisable for successful conversions.
- Natural swimming pools filter water through biological processes, often using wetland plants and gravel beds to maintain clear, clean water.
- Overlooked challenges in existing ponds demand careful management to prevent issues like poor circulation or organic matter buildup.
- Aquatic plants can be reused during the conversion process and repurposed in a low-nutrient substrate, further reducing costs.
- A small solar-powered circulation system can aid in acclimating the plants to the new balance and minimizing energy consumption.
