hth® pool care kit for opening & closing is an effective, multi-purpose product that sanitizes, clarifies, helps prevents algae and shock treats your pool. hth® Pool Maintenance 101 has all the pool maintenance tips you need to . Use the hth pool care kit for opening and closing in addition to the steps below. Step 1: Balance. From simple issues like cloudy water or pH fluctuation to more specialized problems like metals in your water and cleaning filters, these . This video shows you how to prepare your pool for swimming season using an HTH Pool Start Up and . The HTH Pool Start-Up and Maintenance Kit is easy-to-use and conveniently packaged. It will help you get started on your way to enjoying sparkling blue, crystal .