About This Item Get clear, comfortable water with this convenient and easy-to-use sanitizer. HTH Spa Clear Chlorinating Sanitizer controls algae, kills bacteria and destroys contaminants. For best results, use HTH Spa Clear Chlorinating Sanitizer as part of your regular HTH Spa care routine. How To Use HTH Spa Clear Chlorinating Sanitizer For best results, first use HTH Spa Test Strips to make sure the pH level in your spa water is between 7.2 and 7.8. After your spa water is properly balanced, apply HTH Spa Clear Chlorinating Sanitizer while the filter pump is running. Refer to the on-pack instructions for the correct dosage. About HTH Spa For generations, HTH has been leading the way in smart spa care. We do the chemistry so you can just take it easy. From the very first day you open your spa, HTH is here to help maintain and problem solve. Our complete range of simple-to-use, no-nonsense products empower you to balance, sanitize and treat your spa-it's everything you need and nothing you don't. There is nothing more relaxing than taking it easy in sparkling, clean water. With HTH, your spa is always ready when you are.