Sera Aquatan is a water conditioner which makes tap water safe for fish and plants. It instantly removes dangerous chlorine, chloramine, ammonia and binds heavy metals such as copper, zinc, and lead. Aquatan also adds important minerals, in a bioavailable form, to ensure optimal living conditions for all aquarium inhabitants. Available in 50ml, 100ml, 250ml, 500ml and 5L bottles. This 500ml bottle treats up to 2,000 litres of water.