I just upgraded. Due to space constraints I didn’t have room for the triple cartridge. I added two cartridges to the system. I’m now running two carbon block before the RO because we have chloramine. For my resin I’m running BRS pro anion (blue) and a BRS pro mixed bed cartridge (purple). If you run the same setup as me make sure your color change for your mixed bed is cation. Apparently the anion depletes 5X faster than the cation generally. I’m getting 9 TDS out of my RO and 0 TDS out of my resin. I cannot comment on my resin life yet, because I just upgraded. If you have the room get the triple get it, but If you are short on room get the Anion+mixed bed. Anion removes phosphate, chloride, silicate, nitrate and phosphate. Cation removes sodium, calcium, magnesium, and metals.