Pennington Fast-Acting Lime works quickly to help raise your lawn's pH for thicker, healthier growth. This product contains polymers that are impregnated into, and coated onto, the specially engineered granules to continuously release into the soil as moisture is applied to granules. Low pH causes moss, bare spots and weeds to grow in your grass. Fast Acting Lime Plus AST helps to balance the pH, significantly reducing these problems, creating a better soil environment for your lawn. This product can be applied with lawn a spreader (sold separately) for added convenience.