Nutrafin Aqua Plus - Tap Water Conditioner makes tap water safe for tropical fish by neutralizing chlorine, chloramine and undesirable metals. Aqua Plus contains U.S. -patented PHE (pure herbal extract), which effectively reduces stress and prevents inflammation and other undesirable conditions that can arise from scrapes, torn fins and abrasions. Aqua Plus is a complete tap water conditioner that improves aquatic environments for tropical fish. Size: 500 mL (16.9 fl oz)DOSAGE:To remove chlorine:5 mL treats 38 L (10 U.S. gal)To remove chloramine:10 mL treats 38 L (10 U.S. gal)To protect scales & fins:10 mL treats 38 L (10 U.S. gal)Double quantity for saltwater aquariums.