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With these Velda aqua test strips, you can easily determine the water quality of your pond, pool or aquarium based on the six most important values: acidity, total hardness, carbonate hardness, nitrite, nitrate and chloride content. The strips are very simple to use. Just immerse a test strip for a second, and then take it out and shake off the excess water. Wait for about 1 minute and compare the colour on the strip to the colour scale on the tube to learn the water values. Please make sure that the strips are stored cool and dry and avoid temperatures above 30 °C.