I have the TDS meter hooked to my Hydros. The first one is on the DI output and the second is in between the membrane output and the input to the DI cartridge. I also have my RODI automatically refill my DI and my mix tank for me. I cover some of it on my build thread at the end. I don't use a booster pump. The RODI control should be in the next firmware update.In a variation to what is described in this video, I'm hoping to add (2) dual TDS meters soon and place them between the different filters/membranes in the RODI system and connect them to the Hydros that runs my mixing station. I'm also planning to duplicate the booster pump with high pressure solenoid as well as the water feed solenoid controlled by the high and low water level sensors. I'm curious if anyone else has done this (or something comparable) and if you have any helpful insights?