Maintaining the clarity of pool water is an important responsibility of any pool owner. POOLKING has been for years dedicated to protecting your indoor and outdoor pool against bacteria, algae, and other organisms, thus helping you enjoy clean, clear and sanitized water. Simply place tab(s) into the skimmer basket, floater or feeder to sanitize and protect your pool water from algae and bacteria. They are sun protected and designed to dissolve slowly, giving your pool a steady source of available chlorine for up to one week.