Swimming pools could be natural
By Hicbd
Mon Jul 12 2021 6:47 am
"A natural swimming pool is an inset body of water that functions without the use of chemicals. True natural pools clean themselves via a self-cleaning ecosystem within or adjacent to the pool. The first examples of natural swimming pools, which were inspired by natural swimming holes and ponds, were made in Germany. The phenomenon of chemical-free pools remains popular throughout Europe."
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