Prevent Ich is an easy to use treatment composed of 100% multiple organic ingredients for all types of external and epidermal single-celled infections. It's broad spectrum of activity and lack of toxicity makes Prevent-Ich effective without requiring a specific diagnosis. It stops infectious and external parasitic invasions from getting started and in turn prevents many secondary infections. In short, Prevent-Ich suppresses and eliminates a wide spectrum of infections. Prevent-Ich is effective against protozoan parasites on fishes and aquatic invertebrates, whether fresh or brackish water, or marine. Kordon Prevent-Ich contains 5% active ingredients consisting of five natural organic herbals, based on their containing patented naphthoquinones. Totally free of chemicals (such as formalin and malachite) and all heavy metals, including zinc and copper. Does not affect pH of the water, or its oxygen content. Compatible with all Kordon water conditioners. Treats up to 240 gallons. Shipping weight: 1/3 lb.