About This Item HTH Pool Care Filter Cleaner is an essential part of your regular maintenance routine. It quickly and effectively cleans your pool filter to improve filtration efficiency prolong the life of your filter and turn a murky swimming pool into a beautiful oasis. As a multi purpose formula it is great for deep cleaning all filter types and acts as a backwash aid for D.E. and sand filters. This product is compatible with all swimming pools and all filter types. How to Use HTH Pool Care Filter Cleaner Simply follow the on pack instructions to apply HTH Filter Cleaner to your sand D.E. or cartridge swimming pool filter. For best results use HTH Filter Cleaner as part of your regular maintenance routine to improve efficiency. 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 is why we are 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 are 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.