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1.What is TDS: Total Dissolved Solids, also known as TDS. The TDS meter is a great water quality tester tool for water testing kits for drinking water, water filtration and purification systems such as RO or DI systems(Deionized Water Systems), aquariums, hydroponics (test nutrients), pools and spas, commercial and industrial applications and more. 2.•Why care about TDS: High TDS level will change the taste of water,making it salty, bitter or metallic. High levels of TDS also indicate the presence of toxic minerals which is harmful to health. High TDS will harden the water, cause fouling in pipes, dry hair, spots on tableware and also make the kitchen utensils useless. A ppm meter can help you to avoid above problems.