Using reactive (lab) grade KNO3 & KH2PO4

[pepetj]

After being unable to find commercial grade KNO3 and KH2PO4 (only available in bulk orders) I finally got my hands on them. Thing is they're "reactive" (lab) grade.

What would be the dosing guidelines for 99.9% KNO3 and 99-100% KH2PO4? If possible I would like the measurements to be in "teaspoon" although if using grams means more accuracy then go this way.

I noticed the KNO3 is listed as "severe" for Reactivity and "moderate" for both health and contact. while KH2PO4 is listed as "slight" for health and contact.

Pepetj
Santo Domingo

 

[Tom Barr]

Same as ag grade ferts.
I'd not worry, just do not eat the stuff etc.
Labels are required but they are just salts, breathing salts can cause some issues over time with repeated exposure etc.

So can most things we add, but this is no different from the KNO3 issues from ag grade.