Transform your cloudy hot tub water to crystal clear with Pro-Kleen's Spa Clarifier. It contains properties that effectively bind small particles of dirt together, which allows the dirt to be trapped by the hot tub or pool filter. This ensures that no small dirt particles are left behind - leaving the water clear! It adds sparkle and clarity to any hot tub or spa water, while also improving the filter performance and efficiency. Pack size: 5L. Usage: Just add 2 caps of Pro-Kleen spa clarifier to your spa water once a week for crystal-clear water. Note: It is also a fast-dissolving formula that doesn't leave any residue behind!