1 Gallon (128 oz) of All Clear Phosphate Remover - Highly Concentrated 1 gallon - 128 ounces - formulated for professional use Highly concentrated - removes phoshates Non-toxic & non-hazardous This is not an algaecide and does not kill algae Inherently stable with an indefinite shelf life under normal storage temperatures less than 120 F (48.9 C)