Your pool chemistry can change quickly. Test your pool water weekly to ensure your chlorine and pH remain within optimal swimming levels. Anpro Chlorine Tablets are multi-functional swimming pool chlorine tablets work that kill harmful bacteria and unsightly algae. Kill bacteria while preventing pool algae with Chlorinating Tablets. They effectively guard against bacteria, algae, and other organisms. Each tablet dissolves slowly and contains stabilizer for a long lasting clean. Package comes with a floating dispenser, more convenient for you to use. If you have any questions about the item please feel free to let us know.