1. PoolTest Paper The test paper consists of highquality imported filter paper. Some hydrotherapy test strips are packaged in containers that are easy to store. The different colors of the cans and packaging can make the reading accurate and easy to determine. 2. The test paper is readable Soak the test paper in water for 2 seconds, then take it out and wait for 60 seconds. Compare all color changes with the color chart on the side of the bottle to obtain accurate water quality results. This is an easy way to test 16 parameters simultaneously. 3. 16in1 Pool Test Paper PH test paper can test the pH value, chlorine / bromine, total chlorine, total alkalinity, cyanuric acid and total hardness of your pool or spa. Keep the water y and clean all year round. 4. Storage method For results and longer shelf life, please store the product in a dry, cool and dark place. Do not touch the test area of the reagent strip, keep it away from light and moisture. After removing the strip, quickly close the lid again. The bag is sealed to ensure that the test kit can be stored for 2 years.