Natural pool/pond gives us the feeling of being part of nature, that is, being able to swim with fish and surrounded by nature.
The clear water with a greenish surrounding brings quality of life and gives us peace and relaxation.
It saves energy and costs because it is a natural filtration system without chemicals that can often cause dry skin and allergies.
Plants are also part of the filtration, absorbing impurities in the form of nutrients, and the bacteria that proliferate in the filtration system help fight harmful bacteria.