This product must be used in accordance to the following directions by HVACR professionals only.
For general drains, pour 16 ounces into the drain, allow to work 15-20 minutes, flush with warm water and repeat if necessary. For larger drains, use entire contents and allow to work 30 minutes; flush with warm water. To maintain drains, use 8 ounces for small and 16 ounces for large drains weekly.