No offense to anybody but many of the posts on here seem like the blind leading the blind - Ive used the whole line of FF - and Ive used it in FFOF - now im left with all these nutes that cost me 100s of $'s i dont or should i say wont even use - Honestly its all overpriced hype - if you grow in an organic LIVING soil you are shooting yourself in the foot using FF nutes b/c the salts kill all the beneficial microbes in your soil - BB is the only one of them thats organic and for the price of it you can buy all the ingredients and make the same shit hundreds of times in a tea for pennies - plus look at the back of every single FF nutrient not one of them has even .001% of calcium - NOT ONE! - just some advice from someone whose been there and done that - the only reason i even replied to this post is b/c when I started I read up on RIU just like you did and bought into all the BS hype and I just wish I knew then what I know now or someone woulda told me - if you wanna keep it organic then Blue Mountain Organics on Ebay is your best bet you can get their complete line for about $30 with shipping included - no need to check ph no headaches no BS and awesome prices that cant be beat - it has EVERYTHING your plants need and its all natural and alive - trust me your babies will love you for it- shit and take just a quarter of the money yould save and buy a copy of teaming with microbes and youll have a better understanding of all of this - you could also just sprinkle some FF piece of mind fruit and flower into your soil and just water - it costs $10 and your stuff will rock guaranteed -remember the almighty KISS rule - keep it simple stupid! - good luck man -