I have not done any specific tests on it, but I do believe that it works better than the standard pre/post ceramic rings that I was using from Fluval.
I would be interesting for someone (who knows a lot more about water chemistry than I), to do some independent testing on it![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
I would be interesting for someone (who knows a lot more about water chemistry than I), to do some independent testing on it