About This Item When you want to clear dull or cloudy water overnight, HTH Pool Care Drop Out Flocculant is your solution. The fast-acting, dual-action formula drops fine particles like dirt and dead algae to the pool floor for easy vacuuming, so it won't affect pH balance or damage your filter. It also effectively removes phosphates that feed algae and improves filtration. This product is designed to work only with pools that can vacuum settled material directly to waste and not through the filter. How to Use HTH Pool Care Drop Out Flocculant Distribute the product evenly over the entire pool surface. Do not put this product through your filter. Keep the pump running for two hours and then turn the pump off. Allow the suspended material to settle to the bottom of the pool overnight and then vacuum to waste using the filter on the waste or drain cycle. Finally, backwash and/or clean your filter and enjoy crystal clear water. About HTH Pool Care HTH was developed with the pool owner in mind. We know that maintaining your pool water can be a lot of work. That's why we're here every step of the way, helping you clear the uncertainty from pool care. With economical, easy-to-use solutions, HTH is designed to work hard so You're prepared to tackle whatever life throws in your pool. From balancing your water to treating green water, we offer a full line of products to keep your pool water healthy and your swimmers happy.