HT Natural & Clear is a natural enzyme that emulsifies and biodegrades organics (body oils, suntan lotion, etc.) as soon as they enter your spa helping to keep your water crystal clear with no discomfort to the spa user. By removing these organics Natural & Clear helps your sanitizer work more efficiently and reduces the amount of sanitizer required to maintain a proper ppm level. Natural & Clear also helps rid your spa of common scum lines caused by contaminants. NOTE: Most competitors sell Clarifiers that are coagulates that group small particles (less than 15 microns) together making them available for your filter to capture. These less expensive formulas are not natural enzymes, are less effective, and do not help rid your spa of scum lines.