About This Item Cloudy water can be a result of an inefficient sand filter. HTH Pool Care Filter Sand helps ensure your filter is doing its job, so you maintain a clean, clear pool all summer. Only HTH provides the purest, most closely sized pool filter sand available, thanks to a rigorous washing and grading process. This product is great for all swimming pools that use sand filters, including salt systems. How to Use HTH Pool Care Pool Filter SandSimply follow your filter manufacturer’s recommendations for filling a new filter or for replacing sand in an existing filter. For best results, refresh your filter sand every 1.5 years for year-round pools or 3 years for seasonal pools. 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.