inspirational natural swimming pools - personal favorite is the one on the list.
A case study of the third BioNova® Natural Swimming Pool built in New Jersey. Designed and built by BioNova® Natural Pools and Rin Robyn Pools.
Swimpond Landscape Design - this is a really cool idea for naturally filtered swimming pools. They can convert already existing pools and make them into a clean mountain swimming hole.
Collection of 19 incredible natural swimming pools! (via Elle Decor). This is the only way I'd do a pool.
Ecological pool, part of it on the garden itself