The 500 ml bottle of Seachem Amguard is the specially formulated to quickly and effectively detoxifies and removes toxic free ammonia, a chemical compound that acts as a silent killer in your aquarium. Unlike other brands, Seachem Amguard remains potent and doesn’t degrade for up to 72 hours to ensure that all lingering chemicals are eliminated. Additionally, this additive is completely 100% safe for tank inhabitants, does not alter pH levels and all converted non-toxic ammonia is quickly sucked up by the aquarium filter.