carbon block

I see a lot of materials about protecting ro membranes from free chlorine and chloramines. However in my area the water is treated with chlorine dioxide instead, which results in the water containing chlorites and chlorates as opposed to the usual products. I don't have enough knowledge in the...

Residual chlorine (no chloramines) in the water mains where I live in Italy is between 0,03 and 0,05 ppm. Do I need a very good 1 mcr carbon block, or can I just get a cheap 10 or 5 mcr carbon block and replace it once a year? Is it recommended to test for chlorine after the carbon blocks, or...

Residual chlorine (no chloramines, only chlorine and chlorine dioxide) in the water mains where I live in Italy is between 0,03 and 0,05 ppm. Do I need a very good 1 mcr carbon block, or can I just get a cheap 10 or 5 mcr carbon block and replace it once a year? Is it recommended to test for...