Ferts questions

[dski13]

Hi I am new to all of this and have some questions. When you are all talking about dry ferts are they pure chemical or do they have filler? If I have a bottle of lab grad KN03 would that be the same as the dry ferts you are talking about? Also does anyone have a dosing regime in molar concentrations? Calculating ppm drives me nuts. I am particularly interested in a trace mix that has molar concentrations.

Thanks.