potassium phosphate

Sorry, I had another question, when you say the above is what you use, do you mean this stuff" https://www.amazon.com/Monopotassium-Phosphate-Soluble-Hydroponics-Aquariums/dp/B00TZTYK2Q/ref=sr_1_1?s=lawn-garden&ie=UTF8&qid=1491575474&sr=1-1&keywords=potassium+phosphate