Need to purchase a decent amount (more than 1.5 lbs-like BRS packs) of the Cation and Anion color changing resins. BRS has been out of the 8lb bag, and I can't seem to find a source for it. Any advice would be appreciated. I'm open to non color changing options, but I am curious what everyone else uses, or is it just small bags from BRS for me?? Also, does anyone replenish there resin (HCL seems like a bad idea), apologies if this is on a different thread.