Natural Chemistry 86440 Automatic Dosage Dispenser for commercial applications regulates the flow of products into pools and spas. It provides ease of maintenance and ensures consistent and accurate product delivery. By adding small amounts of enzymes regularly, pools and spas will realize the maximum performance of Natural Chemistry's enzymes. Programmable cycles allow for a wide range dosing, from a few drops a day to 2.5 gallons per day. Preset cycles allow fo 1, 2, 3, 4, 6, 8, 12, 24, 48 or 96 injections per day as well as every 2, 7, 14 and 28 days. Duration of each injection can be set from 1 second to 255 minutes.