This product is an on board nitrogen generator. Most companies purchase nitrogen in cylinders at about 2000 p.s.i. We at Pit Crew Tire Service have chosen to invest in a system that will create nitrogen on demand and store it in an on-board 80 gal storage tank at low pressure. (170 p.s.i. for safety concerns) The USA trails European tire technology by about 10 years.
The pH scale indicates acidity or alkalinity. A soil with a pH number below 7 is acid, while one with a pH above 7 is alkaline. Garden plants typically grow best in neutral or slightly acid soil (pH 7 or slightly below; see illustration at left).
Add water to the other container of soil. You want enough that it becomes very wet and muddy. Pour baking soda into this cup; if it fizzes, it means your soil is acidic. http://pad3.whstatic.com/images/thumb/1/13/Test-Soil-pH-Step-13-preview-Version-4.jpg/550px-Test-Soil-pH-Step-13-preview-Version-4.jpg.