Natural Chemistry's automatic dosing pump has been designed to manage the dispensing of liquids in a simple and cost-effective manner. By adding small amounts of enzymes, Phosfree or any other liquid product, several times a day, you guarantee optimal product performance. Easily programmable cycles can be programmed to add to the pool water products ranging from 1 second per week up to 20 minutes, 24 times a day and 7 days a week.