HTH Pool Care 6-Way Test Strips for Swimming Pools 0.5 lb. Contains 35 Strips. Testing your swimming pool water has never been easier. HTH® 6-Way Test Strips test for free available chlorine bromine pH alkalinity calcium hardness and CYA (cyanuric acid) levels. If left untreated unbalanced swimming pool water can irritate swimmers’ skin and eyes cause sanitizers to work less effectively and even damage pool surfaces structures or equipment. The good news You don t need to be a scientist to quickly and easily test your indoor and outdoor swimming pool water. These test strips are great for all swimming pool types including chlorine bromine and saltwater systems.