SeaKlear Spa Natural Clarifier outperforms other clarifiers at removing dirt and oil from spa and hot tub water. When used regularly, this effective formula also keeps metals down, removes oils and keeps the filter cleaner longer. Unlike synthetic, petroleum-based clarifiers, SeaKlear Spa Natural Clarifier actually removes oils from the water. This unique, patented technology reliably keeps spas and hot tubs clear and clean, easily and effectively.