Anyone ever try Pfertz for dosing?

[Kuthoht]

http://pfertz.com/index.html

While doing my planted tank research this morning I came across this site that sells fertilizer for planted tanks.

Has anyone used any of this stuff? It does look pretty simple if you go by the system they lay out.

[Ozymandias]

it works i believe green leaf sells it also. never used it my self, but just look like liquid firtz to me.