Ecological Laboratories Microbe-Lift Nite-Out II, Gallon Specially formulated for rapid ammonia and nitrite reduction through natural nitrification Nitrifying bacteria turn harmful ammonia and nitrite into nitrate Requires high levels of dissolved oxygen for optimal growth, so aeration is recommended Safe for use around plants and animals Gallon of Nite-Out II treats 5,000 gallons of pond water for 11 months