I've been using H16 since I started growing 2 years ago. I mucked up its performance for awhile adding this and that....finally they have a full line (almost...still waiting for the "roots" also some info on their "flush") anyhow, I'm in the middle of week 3 and I'm using the base A+B bloom, Prime, Fire, and Great white for bennies and mycos plus half strength rapid start for GH ( I think) and the yellow bottle of Bloom roots ( I like the smell of the yellow bottle roots nutrient....weird) OH and aqua shield for an enzyme. AAAAAANNNNNDDDDD holy COW lush, vivid green awsome growth for weeks 1+2. middle of Week 3 has very strong flower sites. I'm excited. if you wanna know my ml:gal I think I can paste my excel sheet I made for it. I know that there is one up at H16's web site but I have issues with what they think their nutrients ppm should be ml:gal and what I actually read with my probe as I mix my res. But I'm in the middle of week 3 and I just topped of my res's ppms to 1450. I started the week at 1340 and I plan on hitting 1560 at the beginning of week 4. Thats if theres no signs of burn. If so i'll back off a couple hundred ppms. =)