sisko Member Joined 6 Jul 2008 Messages 39 Location London, UK 1 Aug 2008 #1 Hi all! I have replaced the sponges to JBL SintoMec in my rio 180 filter. My question is can I get rid of the nitrate and/or the carbon sponges? I'm not sure if the rings will completely remove all nitrates and chemicals. Advice please!