KCl, or potassium chloride, is a naturally occurring potassium salt that is used as a fertiliser as well as a raw material for the synthesis of other potassium compounds.
Increasing potassium intake, whether by increasing fruits and vegetables or increasing supplementation, may decrease urinary calcium and also reduce the risk of kidney stones.
Which coefficients would be placed in front of water and oxygen? The 'oxide and water' approach allows the focus to remain on the main teaching point without the need to cover another set of reactions although these could be covered with an appropriate group of students.