Kent Pro Tech Coat Freshwater neutralizes chlorine and heavy metals. It restores the natural slime coating to relieve fish stress, calm, and protect against abrasion. It helps acclimatize fish to new surroundings. It can be used when preparing tap water, making water changes, adding new fish, handling fish, transporting fish, or when fish are wounded. Pro Tech Coat Freshwater is different than competing products because it contains only costly polyvinylpyrrolidone as the coating ingredient. This same product is FDA approved as an ingredient in human medicinal and nutrition products. Competing products contain cheap fillers such as aloe vera and carboxymethylcellulose which then decay in the aquarium and lower the redox and the overall water quality. Pro Tech Coat Freshwater does not affect biological filtration and is safe for all freshwater species including sensitive Discus and Tetras, as well as live plants. Competing products may cause problems with plants. Available in 16 oz size.