ST International Silver Ammonia Remover Highest concentrated Ammonia Remover on the Market Can instantly detoxify and remove ammonia, nitrite and promotes slime coat production Will not affect pH and will not over activate skimmers Excellent for both freshwater and saltwater aquariums Available in 100ml (3.4 flu oz.), 250ml (8.4 flu oz.), 500ml (16.9 flu oz.) and 4000ml (1 US Gal.)