fusQuanto wrote,
i figured
the ferts would have the same problem too because the carbon is soaking
up the nutrients? no?
That makes no sense. Who says this?

Makes sence to me - activated carbon removes; ammonia, nitrite, organic
compounds such as acids, phenolics, proteins, carbohydrates, hormones,
drugs, chemicals, trace elements, and natural metabolic compounds. I
know it removes heavy metals, it sucked the iron right out of my liquid
fertilizer!
.................... Frank