Well thats a handy bit of information. At this point the ppm is at 590 with both the 3 part and 10ml of LK in the 2 gal res. Ive looked all over trying to find which conversion my tester (Hanna Primo TDS tester) is and the best I can find is that it uses the NaCl 500 conversion. So that makes my bloom max ppm at 857 right? Looks like its going to have to live on a half strength solution if its over halfway to max with seedling feed. Thank yo SOO much for bringing this to my attention before I f'd it up. Its so healthy and pretty looking right.:thumbsup: Growing like a ... well.. weed.