Just watched Jake‘s lastest video on reef builders about mixing “sea water” as was shocked that he does not use a RODI but rather a sediment filter followed by 4 carbon blocks and that’s it? says he’s lucky to have good water but when asked in the comments about TDS in the water before and after he simply states that without a membrane (which he does not use) it is the same coming in as going out which is about 200? Almost fell off my chair, why is everyone else in the world so concerned about our RODI systems getting over 1? Yes everyone has different water with who knows what as TDS and chlorinated city water may or may not be worse or better then well water but…. I have well water with very high sediments which measures 700-800 coming in but if the water was IPC tested after using a membrane and no harmful heavy metals were found which TDS of say 20-30 how harmful would that really be? Why use all the expensive DI if you are just removing elements that you may be just adding back in again like say magnesium , iron etc…. just got me thinking after watching that video but I could be way off on this thought lol