This low-acid collection from Volcanica is made for coffee drinkers with sensitive stomachs. Coffees with a pH of 5.2 or above are considered low acid coffees (with water being neutral at a pH of 7). There are many different reasons why and how some coffees are less acidic than others.
The biggest contributing factors to acidity include the altitude the coffee was grown at, with the lower the better; the origin and oftentimes varietal or cultivar of the coffee; the processing method the coffee goes through to strip the coffee seed from the cherry; and the roasting process.