Are you using a kH Reference solution?
Hi JaidexlIt's probably much easier to make a gallon of 4dKH water with small pinches of baking soda, as long as you have source water below 4dKH and trial and 'error' doesn't use up all your KH reagent, then put some in the DC. I think a couple pinches or so will bring a gallon of 0 TDS RO/DI to about 4dKH...
I forgot to mention this about the movie and your Avatar. Did you know that the lady on board the boat that "The Creature" kidnapped was in a Playboy magazine before she made the movie?....No, I haven't seen the 3D version ,just black and white on TV a loooong time ago, lol. I wish I could see it though, I haven't ever seen anything in 3D, isn't that sad?