I use the filter guys, if you call them they are very nice to talk to and will spend as much time on the phone as they need to help you understand what's going on with your filter and what you need. I use there di resin and make my own silica buster cartridge using there silica resin and di resin, prices are reasonable. My water incoming is 227 out of the membrane is 4 an I'm running it at a pressure of 80psi, I'm also monitoring with two inline tds meters, I also have two di cartridges and when the one closest to the carbon block goes I put the end one in its place and put a fresh one on the end
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