MKP (mono potassium phosphate) is cheap.. If its just phosphorus, you can use phosphoric acid. Most growers add P in the form of ph down without realising it
MKP (mono potassium phosphate) is cheap.. If its just phosphorus, you can use phosphoric acid. Most growers add P in the form of ph down without realising it
Mono-Ammonium Phosphate [50lbs Bag] | Hydro-Gardens I also found this mono ammonium phosphate. Which is better?