Ecolab® Ultrasil™ 76 is a nitric acid based detergent. It is used for acid cleaning low pH tolerant reverse osmosis, ultrafiltration and microfiltration membranes while helping maintain membrane flux rates. Ultrasil™ 76 also helps prevent milkstone, alkaline film and hard water scale build-ups. This product is surfactant-free. PH level 1.4.