Does it contain acids? Is it safe for use on patio pavers?

Simple Green All-Purpose Cleaner, in its concentrate, is slightly above pH-neutral, ranging between 8.5 to 9.2. Once it is diluted, it becomes closer to pH-neutral. It contains a small amount of citric acid (less than 1%) in the concentrate, so our product should be compatible with cleaning patio pavers. You would typically dilute our All-Purpose Cleaner at least 1:10, which would be 12 oz Simple Green per gallon of water.