I don't do organic hydro and don't recomend organic hydro. It is a PITA. Organic nutrients and chemical nutrients and the way they behave in a resrvoir are very different. Nutrient reservoirs with organic fertilizers function too much like sewage treatment plants. I am an Environmental Engineer and know quite a bit about waste water treatment systems as I design them and I teach under graduate engineering students how they are designed and teach graduate students how to design them. As a result I do not recommend organic hydro. Huge amounts of problems are quite common with organic nutrient system used with reservoirs and inert media that do not occur with chemical nutrient systems. Like I said they are a PITA. I recomend that those wishing to grow with organic nutrients stick to soil grows.