Ways you were lied to about Natural Swimming Pools

Ask a question here The latest craze coming from across the pond is Natural swimming pools. The timing ties in perfectly as an alternative to the traditional chemically treated backyard oasis in a time where chlorine supply is scarce. They take up twice that area, come at a much higher price tag, and rely upon vegetation to sanitize the water. but, are they safe? I would like to preface this by saying I am 110% in favor of the integration of natural pools into our industry ...