Organic is a tough word to nail down. Manufactures can label their nutes Organic if it's 60% or above. That means even if you're buying organic labeled nutes, they still have some non-organic materials in them. Let me put this in perspective. One manufacture has 60% organics in their mix. They can stick on the organic label. Another manufacture has 59% organics in their mix. They have to label it non-organic. Do you really think you could tell the difference?
Here's the problem I have with labels. Are rocks organic? Let's say you're trying to decide whether Rock Phosphate is organic or not. Clearly it's not a living thing or hasn't been broken down by any living microbe. Technically it's not organic but many manufactures use it in their organic mix because it works so well.
Botanicare's line is about as close to organic as you can get and works well in a Hydro setup. I'm currently using their new "Kind" brand of nutes and having good luck.