Tetra Pond Aquasafe Water Conditioner, 1 Litre. Neutralises aggressive chlorine. Effectively neutralises heavy metals such as copper, zinc and lead. Makes tap water safe for fish by removing harmful compounds and adding beneficial substances. Add 50ml of Tetra Pond AquaSafe to every 1000 litres (220 gallons) of water, to remove heavy metals and chlorine. Either treat mains water prior to using it in the pond, or treat the whole pond with AquaSafe prior to topping it up with mains water. For improving fish health and aiding wound recovery, add AquaSafe at 25ml per 1000 litres (220 gallons) every 2-3 weeks.