Neutralises Chlorine & Chloramine & heavy metals while enhancing the natural slime coating on fish. Make tap water safe for your new aquarium or when doing a water change. Suitable for marine and freshwater. 100ml bottle. Neutralises Chlorine & Chloramine & heavy metals while enhancing the natural slime coating on fish. Water conditioner is essential when filling water into your aquarium for the first time or when changing water in an existing aquarium. Aqua One Water Conditioner improves aquarium water by removing harmful toxins such as chlorine, chloramine and heavy metals found in tap water whilst enhancing the natural protective slime coating on fish.