OCD REPLENISH is a sustainable refill program designed to minimize waste while providing the user with 4 refills of the OCD - ALL PURPOSE cleaner. This product is beautifully packaged and ready to refill your cleaner in a snap. This concentrate is best diluted according to the directions on the bottle mixing with distilled water. .5 ounce or 4 FULL droppers for each 16 ounce bottle. Shelf life of 1 year for consistent performance.