Here's a highly-rated detailed review that addresses the EcoSphere controversy. The author(s) appear to be very well informed. http://www.amazon.com/review/R39Y

Here's a highly-rated detailed review that addresses the EcoSphere controversy. The author(s) appear to be very well informed. http://www.amazon.com/review/R39YUFJKTH4NEF/ref=cm_cr_dp_cmt?ie=UTF8&ASIN=B005IZOB5M&nodeID=2619533011&store=pet-supplies http://www.amazon.com/review/R39YUFJKTH4NEF/ref=cm_cr_dp_cmt...