About This Item HTH Spa Clarifier is a powerful, concentrated formula that helps you restore crystal clarity in your spa water. It coagulates suspended products so they can be more easily removed by the spa filter. HTH Spa Clarifier is great for all spas, including bromine, chlorine and biguanide systems. For best results, use HTH Spa Clarifier as part of your regular HTH Spa care routine. How To Use HTH Spa Clarifier Before treatment, check your spa filter and make sure it is clean. For best results, use HTH Spa Filter Cleaner to clean a dirty filter. Turn the spa circulation system on and run continuously during treatment to ensure proper mixing and filtration. Shake the bottle before applying the clarifier to your spa water. Refer to on-pack instructions for proper 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.