have been trying to set up sps tank for almost 8 months keep finding copper. don't know why i took so long but found .11 copper level using hanna checker at my kitchen sink using brs 150 gallon a day 6 stage rodi 1 micron sediment 1st followed by 2 1 micron carbon blocks then 2 75 gpd dow chemical membranes followed by 2 mixed bed di resins and finally 1 spectra pure silica buster di after this with all brand new filters and di resin my levels on hanna checker are .02ppm is there a way to get it out before it goes in the tank i believe its not the house because i ran a hose to my meter from the city water that is a copper valve i have to hook up to but only little valve and i showed .09 on the hanna so i believe its in the city water