That is what I do, I typically have very little run-off but would rather save it, or save time by having the next mix ready. This is only my 2nd grow btw, but done tons of research. I'm curious after what you said if xtsho meant some nutes can, but only with circulation? Can't just stir it when you need it? Like I said if you have to/should use constant circulation, I will just prepare my nutes as needed. Also, you say everyday??? You on coco-coir? That's crazy lol. Thought coco stayed wet longer. I'm using Pro-Mix HP without coco. I also don't like the idea of transplanting, so I start in bigger pots. I only water the center, with 4 litres for all 9 plants. They last 2 days wet with a fan on them ;p. How would the bottom roots ever get water? I even thought of putting air stones under the medium to really aerate it lol. Thanks again, appreciate any advice