Naturally clear water:
Biological water treatment in swimming ponds with carropools

What is a biological swimming pond?

A biological swimming pond is an artificially created bathing water. The water is purified naturally through the interaction of aquatic plants, microorganisms and special substrates. Unlike conventional cleaning methods, nature takes over the water treatment here, supported by modern filter technology.

The combination of swimming area and planted regeneration zone creates a self-regulating ecosystem that ensures permanently clear, soft water. With the customized solutions from carropools our experienced partner, this dream becomes reality.

Oliver Range
2. Oktober 2025

How does biological water treatment work?

The three pillars of natural cleansing

1. aquatic plants as natural filters
Underwater plants such as milfoil, waterweed and pondweed absorb nutrients directly from the water and compete with algae. Marsh plants such as reeds, rushes and water iris stabilize the ecological balance and produce oxygen.

2. microorganisms in the substrate
A bacterial lawn consisting of millions of beneficial microbes forms in the multi-layered gravel layers of the regeneration zone. These continuously decompose organic material such as leaves, pollen and debris.

3. technical support
Modern components such as circulation pumps, skimmers and biological filter systems optimize the natural processes. Continuous flow through the regeneration zone activates all substrate layers and maximizes filter performance.

The regeneration zone:
The heart of water treatment

The regeneration zone is located outside the swimming area and accounts for 30-70% of the total surface area, depending on the type of pond. This is where the actual biological purification takes place:

Substrate structure: Multi-layer gravel layers offer maximum surface area for biofilm colonization
Plant density: 5-10 plants per square meter for optimal nutrient uptake
Water circulation: Vertical flow (upflow or downflow) for efficient filtration

Your partner for customized swimming ponds

As a bluegardens partner carropools offers sophisticated swimming pond systems that combine Belgian precision work with biological water treatment. The innovative PP materials and complete prefabrication make carropools the first choice for discerning garden owners.

The carropools advantages at a glance

100% made to measure
Every carropools swimming pond is individually planned and manufactured in Belgium with the utmost precision. The size, shape and features are completely tailored to your wishes and your garden.

High-quality PP materials
The black and anthracite-colored PP plastic panels offer decisive advantages:

Smooth surfaces to which hardly any biofilm adheres
Dark colors that contribute to natural water heating
Durability and frost resistance
Low-maintenance properties

Flexible dimensions
carropools swimming ponds are available up to 5 meters wide and 30 meters long, in every conceivable shape. Whether curved and natural or modern and straight-lined: your swimming pond adapts to your garden.

Efficient installation
Thanks to prefabrication and maximum pre-installation (piping, lighting, regeneration zone), the construction time is significantly reduced, much faster than with traditional on-site construction.

Product lines:
Exclusive and Silver Line

Exclusive Line – premium equipment for the highest demands

10 mm thick PP material in dark gray, anthracite or black
Metal ring rail (extra strong) for maximum stability
All lamp models and installation parts freely selectable
Counter-current system for sporty swimming
Automatic slatted roller shutter (rectangular/square design)
All possible inlet nozzles and outlet nozzles

Silver Line – Proven quality at an attractive price

PP ring flange (basic version)
Standard fixtures
carropools quality in the basic version
Ideal for price-conscious builders

Configuration options

carropools offers you various equipment options:

Regeneration zone: plant areas can be positioned on the short or long side
Flow system: upflow or downflow
Skimmer: Integration for optimum surface cleaning
LED lighting: pre-installed for atmospheric evenings
Counter-current system: for sporty swimming
Automatic roller shutter: Safety and cleanliness (rectangular models)
Freestanding option: possibility of installation without burying

Your advantages with a carropools swimming pond

Natural bathing experience

The biologically treated water is clear, soft and particularly kind to the skin. With careful planning, the water quality often reaches drinking water level, ideal for families with children and people with sensitive skin.

Energy-efficient and sustainable

Energy-efficient pumps and natural self-cleaning properties keep running costs low. No complete water exchange required, minimal use of technology.

Self-regulating water quality

After a running-in phase of 1-2 seasons, the biological system largely regulates itself. Maintenance is limited to occasional pruning of plants, removal of leaves and cleaning of the equipment.

Habitat for biodiversity

Your swimming pond becomes a valuable biotope: dragonflies, butterflies and birds are attracted to the water oasis. A real nature experience right in front of your patio, all year round.

Aesthetic effect all year round

Even in winter, your swimming pond remains a visual highlight. The water surface reflects the light, grasses sway in the wind and hoarfrost on the plants creates a magical atmosphere.

Is a carropools swimming pond suitable for every garden?

Yes, basically. Thanks to the flexible sizes (up to 5 m wide × 30 m long) and the individual design, suitable concepts can also be developed for different plots. Expert advice from bluegardens and carropools will help you to find the optimum solution for your situation.

How long does it take to install a carropools swimming pond?

Thanks to prefabrication in Belgium and maximum pre-installation, the construction time is significantly reduced. The exact installation time depends on the size and complexity of your project. bluegardens will provide you with a detailed schedule.

How long does it take for my swimming pond to become stable?

An initial improvement in the water quality is usually visible after a few weeks. A stable biological balance is usually achieved after 1 to 2 seasons. After this running-in phase, you have a low-maintenance, self-regulating system.

Which carropools product line suits me?

The Exclusive Line offers maximum equipment with 10 mm PP material, metal ring rail and all extras (counter-current system, automatic roller shutter). The Silver Line impresses with proven carropools quality at an attractive price. Let bluegardens advise you on which solution best suits your requirements.

How much does a carropools swimming pond cost?

The costs vary greatly depending on size, equipment and product line. For a concrete calculation, please contact us – we will provide you with an individual offer based on your specific requirements.