Helps Conserve Water & Energy: This Natural Chemistry cover free is an advanced mono-layer technology that helps save water and money by decreasing evaporation. pH Neutral: Cover Free is compatible for use with all sanitizing systems and is pH neutral. Invisible Barrier: Cover Free's technology creates a layer that is formed on the water line even after it is disturbed by swimmers or wind. This product is to be used only in swimming pools. Save Water: Cover Free creates an invisible barrier on the surface of the water that works even when swimmers are in the pool. Save water, save heat and save money with Cover Free! Tested and Proven Effective: Natural Chemistry products are known for delivering reliable results and making water care less complex. Natural Chemistry carries an extensive line of pool and spa solutions that match your unique needs. This Natural Chemistry cover free is an advanced mono-layer technology that helps save water and money by decreasing evaporation. It reduces water evaporation by up to 85-percent and reduces heat loss by as much as 70-percent. Invisible barrier that conserves water and heating energy. Helps conserve hundreds of gallons of pool water. Excellent surface tension helps product remain in place. pH is neutral. Recommended dosage are 4-ounce per 20,000-gallons of water or 667-square feet per week. It can apply using the measuring guide on side of the bottle and squeeze recommended dose over the surface of the pool water. Surface tension allows cover free to remain in place or reform during swimming. Includes 6 cover free container per pack. Comes in 32-ounce container.