I wasn't including auto dosers in my list of requirements but everything else related to grow room and reservoir. I don't even like the idea of auto nutrient dosing that much. I always shake the bottle before using them and an auto doser wouldn't do this. Plus it's a lot of expense just to take care of an easy job, in my situation at least. But for me an auto PH doser would be useful. I hate adjusting PH and maintaining it. I'm always impatient and I add too much PH up or down. Then I have to let it settle, add less at a time, wait longer for settling, stick my head down a dark barrel holding a little torch and PH pen, then repeat. That's something that I could do without.