How does the water stay clean?
Clear, clean water is the naturally occurring state in low-nutrient ponds and lakes if the body of water is large and deep enough. Swimming ponds are purposely built to emulate this state and are a prime example of how we can harness nature's intelligence effectively.
A conventional swimming pool uses chemicals to kill micro-organisms in the water such as phytoplankon (microscopic single-celled algae, which in abundance make the water go green) and bacteria. However this isn’t necessary in a natural pool where the cleaning work is carried out by micro-organisms which exist together in equilibrium.
This is the basic principle of a swimming pond - to use the natural purifying properties of plants and micro-organisms to sustain clean, clear and healthy water.
In natural water, the main filter is the whole water body, as each part of water is constantly being filtered by microscopic life-forms.
However, in swimming ponds it is also essential to keep the nutrient levels very low, to ensure that single-celled algae are always controlled by zooplankton, and to prevent the growth of blanket weed (string algae). To do this we filter the water through shingle and other mediums using a small pump. Plants also perform a useful function taking nutrients out of the water as they grow. By keeping the levels of key nutrients low and in balance, algae is not able to grow or is very minimal, and the result is clear, clean and healthy swimming water.
We use standards required by the German swimming pond association (more stringent than the International swimming pond standards, which are adopted by default by the British Association of Natural Swimming Pools), which are used in hundreds of public swimming ponds in Germany and thousands of private swimming ponds.
Below is a very simplified drawing of how our filter system works - in reality there are many elements which go into making up an effective filtration system but this shows the basic principle:
"The clarity is amazing, really crystal-clear, you could read a book on the bottom"
Chris Graham Bucks
"The water is beautifully clear and people are genuinely fascinated by how something so visually pleasing can work so well"
Simon Wood Kent
"We wanted something that worked and clearly it works - the water's beautiful. How often do you normally swim in fresh water? Very rarely - it's either the sea or the swimming pool. Swimming in fresh water is wonderful. It's like swimming through silk."
Oliver Morgan Suffolk
"The water is wonderfully clear and you find yourself drawn to the space. You want to just sit out there with a cup of tea, absorb the peace and contemplate the world."
Sean Moore East Sussex