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Have you ever wondered why your boiled tap water sometimes has an odd taste? Or questioned whether your water filter is truly effective? Understanding your water quality doesn't require complex lab tests – a simple TDS tester can reveal what's really in your water.

TDS, or Total Dissolved Solids, represents the combined content of inorganic salts, organic compounds, and metal ions dissolved in water. Essentially, it measures the invisible impurities in your water. Higher TDS values indicate more dissolved substances.

TDS testers operate by measuring water's electrical conductivity. More dissolved ions mean greater conductivity. These devices contain two electrodes that create a circuit when immersed, measuring how easily current flows through the water.

The tester converts conductivity readings to TDS values using a conversion factor (typically 0.5-1.0). Different models may use varying coefficients, so always consult your device's manual.

• Digital Models: Feature clear digital displays, higher precision, and often include temperature measurement. These represent the current standard for home use.
• Analog Models: Use needle gauges that require manual interpretation. While less precise, they offer budget-friendly options for basic testing.

1. Prepare the tester by cleaning electrodes with distilled water and drying thoroughly
2. Submerge the electrodes in your water sample without touching container surfaces
3. Gently stir and wait for the reading to stabilize (typically seconds)
4. Clean and dry electrodes after each use

• Drinking Water: WHO recommends under 500 mg/L, while China's standard allows up to 1000 mg/L (though under 300 mg/L tastes best)
• Purified Water: Typically near 0 mg/L, though long-term consumption may reduce mineral intake
• Mineral Water: Naturally higher in beneficial minerals, with varying TDS by brand
• Aquaculture: Requires precise TDS ranges specific to fish or shrimp species

• Reverse Osmosis (RO): Most effective at removing dissolved solids
• Ultrafiltration (UF): Targets larger contaminants but has limited effect on TDS
• Carbon Filters: Improve taste but don't significantly reduce TDS

TDS testing provides valuable insight into your water's composition, helping you make informed decisions about filtration and consumption. With this knowledge, you can better ensure the safety and quality of your household's water supply.