Swimming pools have long been a symbol of luxury and relaxation, but not all pools are created equal. As awareness around environmental impact and health increases, many pool owners are choosing between traditional chlorine pools and a more eco-friendly alternative: natural pools. But what exactly is the difference between a natural pool and a chlorine pool, and which one is right for you?
In this article, we’ll explore everything you need to know about natural and chlorine pools—from how they work and their maintenance needs to cost, aesthetics, health considerations, and more. We’ll also compare these two popular pool types across a variety of criteria so you can make an informed decision for your backyard, lifestyle, and values.
Understanding the Basics: What Defines a Chlorine Pool?
A chlorine pool is the traditional, widely accepted backyard or public swimming pool system. It uses chlorine-based chemicals to sanitize the water and kill bacteria, algae, and other contaminants.
How Chlorine Pools Work
Chlorine pools operate by introducing chlorine—either in liquid, granular, or tablet form—into the water, where it reacts to form hypochlorous acid, a powerful disinfectant. This chemical effectively eliminates harmful substances and ensures the water remains clean and safe for swimmers.
Filtration and circulation systems also play a crucial role in a chlorine pool’s maintenance. Water is regularly pumped through a filter to mechanically remove debris, and chlorine levels must be tested and adjusted regularly.
Pros of Chlorine Pools
- Effective Sanitation: Chlorine is highly effective at keeping the pool water clean and safe from harmful microbes.
- Established Technology: Chlorine pools have been around for decades with many resources available for maintenance and repair.
- Quick to Install: Compared to natural pools, chlorine pools can usually be set up more quickly.
Cons of Chlorine Pools
- Chemical Dependence: Chlorine requires consistent testing and addition, which can be time-consuming and expensive.
- Skin and Eye Irritation: Chlorine can cause dry skin or eye irritation for some swimmers.
- Environmental Impact: Chlorine is a strong chemical that can be harmful to the environment if not handled properly.
Exploring the Alternative: What Is a Natural Pool?
A natural pool, also known as a natural swimming pool or eco pool, mimics the self-purifying system found in nature, such as a clean forest pond or lake. Unlike traditional pools, natural pools use biological filtration rather than chemicals like chlorine to keep the water clear and safe.
Design and Functioning of Natural Pools
Natural pools typically have two zones:
- Swimming Zone: This is the deeper, clearer part of the pool where people swim.
- Regeneration Zone: In this area, aquatic plants—often alongside gravel beds, biofilters, or special microbes—clean the water naturally by absorbing nitrates, phosphates, and other nutrients that might otherwise support algae growth.
The pool is circulated so water flows through the regeneration zone and returns purified and filtered. These systems can also integrate skimmers and pumps similar to chlorine pools, but without harsh chemicals.
Pros of Natural Pools
- Environmentally Friendly: Natural pools eliminate reliance on harsh chemicals, which benefits both users and local ecosystems.
- No Chemical Imbalance Concerns: Water doesn’t require constant pH adjustments or chemical balancing as long as biological systems are maintained.
- Landscaping Element: The use of water plants and integrated design can make these pools an attractive landscape feature, blending into natural surroundings.
Cons of Natural Pools
- Higher Initial Cost: Design and installation of a natural pool can be more expensive than a basic chlorine installation.
- More Space Required: The regeneration zone adds to the total footprint of the pool, which may not suit smaller yards.
- Specialized Maintenance: While no chemicals are involved, the biological balance of the water requires attention to plant life, biofilter health, and possibly fish or amphibian introduction.
Key Differences: A Comparative Overview
To better understand how these two pool options stack up, let’s compare them across a range of key criteria that influence pool ownership decisions:
1. Chemical Use
| Feature | Chlorine Pool | Natural Pool |
|———————–|—————————————-|—————————————–|
| Chemical Disinfectant | Yes – uses chlorine or bromine | No – relies on plants and natural filtration |
| Water Testing Needed | Daily/Weekly testing required | Less frequent, more biological monitoring needed |
| Health Impact | May irritate sensitive skin or eyes | Generally gentler on skin and eyes |
Chlorine pools depend heavily on chemical disinfectants to maintain hygiene, while natural pools use a balanced ecosystem for purification.
2. Maintenance
| Category | Chlorine Pool | Natural Pool |
|——————–|———————————————-|——————————————-|
| Daily Task | Testing and adjusting chlorine/PHE levels | Monitoring water circulation and plants |
| Skimming Required | Yes | Part of some systems |
| Algae Risk | Reduced with consistent chlorine use | Risk managed via plant balance |
| Energy Consumption | Moderate (filters/pumps) | Moderate to low, varies with design |
While chlorine pools require more frequent chemical attention, natural pools require a deeper understanding of ecological systems to maintain balance. The maintenance styles are different, but neither is objectively easier or harder.
3. Environmental Impact
| Factor | Chlorine Pool | Natural Pool |
|———————-|—————|—————————————|
| Chemical Runoff | High risk | Very low risk |
| Biodiversity Support | None | Encourages beneficial insects, frogs |
| Water Consumption | High | Relatively lower due to reuse system |
Natural pools offer distinct environmental benefits, particularly for those concerned about ecosystem health and sustainability around their home.
4. Aesthetic Appeal
| Feature | Chlorine Pool | Natural Pool |
|——————-|—————|————–|
| Design | Standardized shapes and tiles | Can blend into landscape |
| Water Appearance | Clear blue | Can range from clear to slightly greenish |
| Visual Integration| Pool-centric | Garden-integrated, often resembling a pond |
Natural pools offer unique aesthetic opportunities, with landscape design playing a central role in their appeal. Chlorine pools tend to be more “swim-focused” and less integrated into green surroundings.
5. Health and Wellness
Natural pools promote wellness in a unique way by combining swimming with exposure to nature. Many people say they feel refreshed in a natural pool. Benefits include:
- No skin dryness—due to lack of harsh chemicals.
- No strong chlorine odor—ideal for people with asthma or allergies.
- Natural therapy—swimming in a nature-mimicking environment supports mental well-being.
Chlorine pools have benefits in terms of consistently clean water and predictable hygiene, making them appealing for families with small children. However, some individuals prefer to swim chemical-free for health reasons.
Cost Comparison: What to Expect
1. Upfront Installation Costs
- Chlorine Pool: Ranges from $25,000 to $50,000 for a basic in-ground pool.
- Natural Pool: Generally more expensive, with installation costs ranging from $50,000 to $100,000+ depending on design complexity, size, and integration with surrounding landscapes.
Natural pools require additional engineering in the form of regeneration zones, integrated planting systems, and sometimes advanced biological filters.
2. Ongoing Maintenance Costs
- Chlorine Pool: Ongoing costs include chlorine, pH adjusters, algaecides, filter cleaning, and electricity for pumps (which can cost $20–$50/month).
- Natural Pool: Lower chemical input and potentially lower energy costs, but requires periodic maintenance of the biological system (e.g., trimming plants, checking equipment like UV sterilizers or pumps if used).
Many pool owners report lower long-term costs with natural pools—especially after the initial higher investment.
Who Should Choose a Natural Pool?
Natural pools are ideal for eco-conscious homeowners, nature lovers, and those seeking a harmonious backyard design.
Best Suited For:
- Families and individuals who prefer chemical-free living
- Homeowners who enjoy landscaping and yard work
- Areas with sufficient sunlight and space for a larger pool footprint
Some natural pool designs even integrate with backyard ecosystems, fostering local wildlife and making the pool a functioning part of the garden.
Who Should Choose a Chlorine Pool?
Chlorine pools remain the standard for many, particularly where rapid installation, predictable upkeep, and accessibility are priorities.
Best Suited For:
- Those who value consistent clean and hygienic water
- Households with frequent use, especially by children
- Backyard limitations where space is at a premium
Chlorine pools are often easier to find local service support and have a more defined installation and maintenance path due to decades of widespread use.
Making the Right Choice: Pool Evaluation Guide
The decision between a natural and chlorine pool depends on your lifestyle, values, and priorities. Below, we outline the considerations for making that final decision.
1. Budget and Long-Term Planning
Natural pools require a larger upfront investment, but potentially offer longer sustainability and aesthetic value. Chlorine pools have lower initial costs but can carry higher chemical and maintenance expenses over time.
2. Environmental Values
For those who care about minimizing chemical use and supporting biodiversity, a natural pool can align with green living goals.
3. Health and Sensitivities
Swimmers with sensitive skin or respiratory issues such as asthma often experience improved comfort in natural pools without chemical exposure.
4. Design Preferences
If you want your pool to be more than just a swimming space—with garden integration and eco-aesthetic design—a natural pool could be your best option.
5. Maintenance Comfort
Determine which maintenance style suits you best. Do you enjoy hands-on ecological gardening, or prefer regular chemical care with consistent protocols?
Conclusion
So, what is the difference between a natural pool and a chlorine pool?
The fundamental distinction lies in how each pool system maintains water quality—through chemical disinfection for chlorine pools versus biological filtration and natural purification in natural pools. Each has its own benefits and drawbacks, and the best choice depends on your personal preferences, budget, space, and values.
Natural pools offer a stunning, eco-friendly alternative for those seeking harmony with the environment, offering cleaner, gentler water without harsh chemicals. Chlorine pools, while long-standing and reliable, provide consistent cleanliness and accessibility for families and frequent users.
Whether you opt for the crystal clarity of a chlorine pool or the earthy elegance of a natural pool, the most important factor is that your pool supports your lifestyle—and brings joy every time you take a dip.
What is a natural pool?
A natural pool, also known as a natural swimming pool or eco-pool, is a type of swimming pond that uses natural processes and aquatic plants to purify the water. Designed to mimic a clean, freshwater pond, it typically includes a regeneration zone filled with water plants that filter and clean the water by absorbing nutrients and preventing the overgrowth of algae. These pools often have a more natural aesthetic and can blend into the surrounding landscape, offering both a functional and ecological approach to backyard swimming.
Natural pools are free from harsh chemicals like chlorine and rely on biological filtration systems to maintain clean and swimmable water. They may also include mechanical filters and UV sterilizers as part of some designs, but these are used to enhance the natural purification process rather than replace it. Because they emulate natural ecosystems, they are often seen as more environmentally friendly and can even attract local wildlife such as birds and beneficial insects.
What is a chlorine pool?
A chlorine pool is a conventional swimming pool that uses chlorine as the primary disinfectant to kill bacteria, viruses, and algae. Chlorine is added in various forms—liquid, granules, or tablets—to ensure the water remains safe and clean for swimmers. It works by breaking down contaminants and preventing the growth of harmful microorganisms, making it a widely used method in residential and public pools.
Chlorination requires regular maintenance and testing to ensure that chlorine levels remain within a safe and effective range. Too little chlorine can result in unsafe water conditions, while too much can irritate the skin and eyes. Many people appreciate chlorine pools for their clarity, the proven effectiveness of the disinfection method, and the ability to maintain consistently clean water even with heavy usage.
How do natural pools and chlorine pools differ in maintenance?
Natural pools require a different kind of maintenance compared to chlorine pools. Instead of testing and adjusting chemical levels, the focus is on maintaining the health of the plants and biological filtration system. This may include pruning aquatic plants, managing algae growth naturally, and occasionally checking mechanical components like pumps and filters. While chemical testing is minimal, the overall eco-system must be monitored to ensure water remains clean.
On the other hand, chlorine pools demand more frequent water testing and chemical adjustments to maintain proper pH and chlorine levels. Regular use of test kits or digital testers is necessary to avoid water imbalance, which can lead to cloudy water, bacterial growth, and swimmer discomfort. Maintenance for chlorine pools also often includes running the filtration system for several hours each day and performing routine shock treatments to eliminate built-up contaminants.
Are natural pools safe to swim in?
Yes, natural pools are safe to swim in when designed and maintained correctly. The water purification system relies on natural filtration through plants and microorganisms, which remove impurities and inhibit the growth of harmful bacteria. Natural pools meet hygiene standards through this biological filtration, which mimics the way a clean lake or stream maintains water quality in nature.
However, natural pools require careful attention to system balance. Factors like overuse, poor design, or improper plant maintenance can compromise water quality. To ensure safety, many natural pool owners also integrate some mechanical and UV-based cleaning systems. When properly managed, natural pools can provide safe and enjoyable swimming conditions while minimizing exposure to synthetic chemicals.
What are the environmental impacts of chlorine pools versus natural pools?
Chlorine pools typically have a higher environmental footprint due to the use of chemical disinfectants and the resources required for water replacement and maintenance. Chlorine production involves chemical processes that can be energy-intensive, and the chemical itself may harm aquatic life if not properly neutralized before water is discharged. Additionally, the energy used by pumps and filters adds to the pool’s environmental impact.
Natural pools are generally more sustainable because they rely on natural processes to maintain water quality without the use of synthetic chemicals. They often require less energy, especially when designed with water recirculation and plant-based filtration systems. These pools can also support local biodiversity by attracting beneficial insects, birds, and microorganisms, making them an attractive option for eco-conscious homeowners.
Which type of pool is better for sensitive skin or allergies?
Natural pools are often considered a better option for individuals with sensitive skin or allergies because they do not use chlorine or other harsh chemicals. The absence of these irritants results in gentler water that is less likely to cause dry skin, red eyes, or allergic reactions that are commonly associated with chlorine exposure. Many people with skin conditions such as eczema or respiratory issues like asthma find natural swimming pools to be more comfortable.
In contrast, chlorine pools can lead to irritation, especially in individuals who are sensitive to chemical exposure. Chlorine is known to cause skin dryness and may exacerbate conditions like dermatitis. Moreover, the chemical can volatilize into the air, potentially irritating the lungs, particularly in indoor pools. While chlorine is effective at killing germs, those seeking a more natural and hypoallergenic swimming environment often opt for natural pools.
How do the costs of building and operating a natural pool compare with a chlorine pool?
Building a natural pool can be more expensive upfront compared to a traditional chlorine pool, primarily due to the complex design and construction required to support a balanced aquatic ecosystem. The regeneration zone with plants, specialized filtration, and landscaping contributes to higher construction costs. However, once established, operational costs may be lower because natural pools reduce the need for chemical purchases and sometimes require less energy-intensive filtration.
Chlorine pools generally have lower initial installation costs but may incur higher ongoing expenses. These include the regular purchase of chlorine, pH adjusters, algaecides, and other water treatment chemicals. Additionally, maintaining the proper chemical balance and replacing water lost to evaporation or backwashing can add to long-term running costs. For those considering budget and simplicity in the short term, chlorine pools may be more appealing, but the long-term cost of natural pools can be competitive or even more favorable.