The Natural Chemistry Pool Perfect + Phosfree is a water treatment product that helps to maintain clean and clear pool water. Made by the brand Natural Chemistry in the United States, this product is designed to effectively remove phosphates and other contaminants from your pool water. The single pack size is 3 liters, making it a convenient choice for treating medium-sized pools or spas. With its natural chemistry formula, this product provides a hassle-free solution for keeping your pool water in top condition.