This is a Water Repair "Neutralize" One-Step Treatment for Aquarium Water by Doctors Foster and Smith. It will neutralize harmful chlorine and chloramine in tap water when refilling or replenishing the aquarium. The container is 1.89 liters (64 fl oz) and will treat 14,500 liters (3,840 gal). For aquariums use only. Pick up only from Cobble Hill.