Use distill water or rain water. There is a chance that your drinking water is hard water. If you already have a JWA, you can use it to check whether the water is suitable for pesticides. When you add a few drops of JWA to water, the color of the water does not change. If you don't have JWA, you can check the water hardness using: It is recommended that it comes out below 25ppm.

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