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The Fritz Liquid Water Test for Calcium is a specialized and essential tool for aquarium enthusiasts. This easy-to-use test kit allows for precise measurement and monitoring of calcium levels in aquatic environments. Calcium is a critical mineral in the water chemistry of aquariums and particularly in reef tanks where it is essential for the growth and health of corals, mollusks, and other marine organisms with calcium carbonate skeletons or shells. Maintaining the correct calcium concentration is crucial for ensuring the well-being and vitality of these aquatic inhabitants. Provides a reliable method for aquarists to monitor calcium levels accurately. With clear instructions and dependable reagents, this test kit enables users to maintain stable calcium levels within the optimal range for their specific aquatic setup. To remove childproof safety cap, push down while turning. Fill a test tube with 5 ml of water to be tested (to the line on the tube). Add 10 drops from Calcium Test Solution Bottle #1, holding dropper bottle upside down in a completely vertical position to ensure uniformity of drops added to the water sample. Cap the test tube and gently shake several times to mix solution. Attention! Always use the cap. Avoid skin contact as this may affect the test results. Vigorously shake the Calcium Test Solution Bottle #2 for at least 10 seconds. Holding the bottle vertically, Add Calcium Test Solution #2 drop by drop into the test tube , shaking gently between and counting drops. Stop when the solution changes from pink to blue. As the blue endpoint is approached, color will change from pink to purple before changing to blue. After purple color forms, only 1-2 more drops should be required to reach the blue endpoint. Calcium level is # of drops x 20. Use chart to determine calcium level.