4 x 1 clarifier produces super clear water fast through a highly effective 4 x 1 action - the rich green emerald formulation combines a powerful clarifier, sequestrant, chelating agent and flocculent in one convenient product. The Emerald Stuff™ requires no premixing, will not affect pH and is compatible with all swimming pool sanitizer systems. The Emerald Stuff™ removes oils, soaps, metals, cosmetics and other particulate matter that can cause staining, cloudy water and discoloration. The Emerald Stuff™ also increases filter efficiency.