I need the hydrogen peroxide experts. I am swithching to peroxide from chlorine. The people that live in my area (Rural Northern il) have had great sucess with it and I am not wild about the chlorine. My question is about contact time. I know of several people that switched from chorine to peroxide and when they had it done the water expert removed there retention tanks because "they are not needed" with peroxide. I have sampled the two homes that I am talking about and they both have great water. I allready have two 80 gal. tanks for the chlorine system should I get rid of them or use them. I would prefer to get rid of them and add an organic trap/water softener and it would help with space. What do you think?? I am using centaur carbon after the peroxide (injected into a static mixer). What amount of peroxide do I need in the water? My sulpher is 6ppm. I have read 15 to 25 ppm on the peroxide. Can I test after the carbon filter or will that scew the result?