The Selective Micro A15 generates 7.5 gallons of 500 ppm ultra pure Chlorine Dioxide. Simply remove the sachet and place it in a covered tank or bucket and generate for 10 hours. Dilute the solution to fit your needs. The A15 is registered with the Food and Drug Administration and falls within the categories of lowest toxicity. We recommend the A15 for food processing, hard-nonporous food and non-food surfaces and general sanitization.