Mills is what I have been using for probably a year now at least. It is expensive to begin with but
it lasts. The basis that you use all through the grow us pretty cheap when you buy it in the 5 L jars. They just
came out in the US with a new additive called Vitalize that looks like it is doing amazing things on my plants i have going now, but I am not sure as I have not grown those before. Anyway, the Vitalize is very expensive but you only use a very small amount and 500 ML bottle will last me a over a year. I have never had nute burn or lock out using the Mills.