http://wcco.com/consumer/moss.chlorine.pools.2.796768.html I had read a while back about this type of stuff before (or I'd seen it on extreme home makeover) and I could not source it. Now I have a source article, and while I do live in the coldish north, one day I think I'd like to have a pool, and I can now have nice water. :)
Exerpt:
Creative Water Solutions filters now treat pools and spas across the country. They get most of their moss from New Zealand which has a thriving moss harvesting industry, but they say the moss in northern Minnesota works just as well.
Exerpt posted just in case the article goes poof on me.