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About This Item When used as directed this HTH Spa Filter Cleaner helps your filtration system work more effectively which not only helps keep the water looking clean and clear but also helps the filter last longer. HTH Spa Filter Cleaner is great for all spas including bromine chlorine and biguanide. For best results use HTH Spa Filter Cleaner as part of your regular HTH Spa care routine or every 90 days when you change out your spa water. How To Use HTH Spa Filter Cleaner Remove cartridges from your spa filter and hose off with water to remove loose debris. Fill a clean plastic container bucket pail or garbage can with 4 gallons of water. Empty the contents of the HTH Filter Cleaner bottle into the water to create the cleaning solution. Place the cartridges upright in the solution and soak for 3 to 6 hours or overnight. Remove cartridges from the solution hose off and replace in your spa filter. About HTH Spa For generations HTH has been leading the way in smart spa care. We do the chemistry so you can just take it easy. From the very first day you open your spa HTH is here to help maintain and problem solve. Our complete range of simple to use no nonsense products empower you to balance sanitize and treat your spa it is everything you need and nothing you do not. There is nothing more relaxing than taking it easy in sparkling clean water. With HTH your spa is always ready when you are.