I have only seen this product on one website that has a question and answer section from a guy named Alan and it has been promoted on there for a few years now. I have not been able to find any info about it from any other source. My concern would be how much backpressure would it introduce into the plumbing system. Similar passive circualting returns have been used in reef aquariums for a while now. Non of them have really stood up over time. Don't know if this one for pools would be any better. Calcium deposits would probably stop it from circulating, much as the ones used in aquariums tend to do with calcium buildup.
I, for one, am skeptical.
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