About This Item Whether you are opening your pool for the first swim or closing it for the season HTH Pool Care Kit is a convenient multi purpose kit that prevents stains and pool scale kills bacteria clarifies shock treats and prevents algae in up to 20000 gallons of water. And with the HTH 6 Way Test Strips you can easily check levels of chlorine pH total alkalinity total hardness and cyanuric acid CYA. The kit is not only a great value it is easy to use and compatible with both chlorine and salt water systems. Plus it features HTH Shock Ultra with Cal Hypo which boosts chlorine levels without overstabilizing your pool water. How to Use HTH Pool Care Kit Use at the beginning and end of every pool season to make pool opening and closing as easy as can be. Simply follow the on pack instructions for each product. Each kit includes two 1 lb. bags of HTH Shock Ultra one 12 oz. bottle of HTH Algae Guard Granules one 1.25 lb. bottle of HTH Metal & Stain Defense Granules and one pack of 10 HTH Multi purpose 6 Way Test Strips. 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.