Use Aquachek Red 4-Way Bromine Test Strips to test for Total Bromine, pH, Total Alkalinity, and Total Hardness in your pool and spa water. One bottle of Aquachek Red Bromine can test up to 50 strips per bottle. To use, take one Aquachek strip and quickly dip it in your swimming pool or spa water and remove immediately. The results will appear in seconds and you can easily match up the test strip results to the back of the bottle. For complete instructions view the included instructions that come with the kit in 15 languages. For the best results of your spa, simply test the water before each use. Again this only takes a few seconds. For the best results of your swimming pool water, test your pool water at each end of the pool at least twice a week. A good tip is to record the results each time your test your pool or spa water to track changes over time.