Natural Chemistry Scale Free is an easy and effective way to prevent nasty scale buildup and stains from forming on pool surfaces and equipment. Its powerful liquid formula uses no harsh acids or phosphates, and can be added directly to your pool water without dilution. It is especially useful for pools equipped with salt generator cells, preventing them from clogging. Best of all, Scale Free is compatible with all sanitizing systems as well as pool surfaces, making it a great addition to any pool!