A TDS meter (Total Dissolved Solids) is an instrument used to measure the concentration of dissolved solids in a liquid, typically water. Dissolved solids include salts, minerals, and metals that are dissolved in the water and can affect its quality.
TDS meters are often used to assess water purity and the effectiveness of water filtration systems.
A TDS meter works by measuring the electrical conductivity of the water. Dissolved solids, such as salts, increase the conductivity of the water as they create ions that can carry an electrical current. The TDS meter converts this conductivity into a TDS value, usually expressed in parts per million (ppm).
Applications of TDS meters
Drinking water: TDS meters are often used to monitor the quality of drinking water, especially in homes that use water filtration systems or reverse osmosis. A low TDS value generally indicates purer water.
Aquaculture and aquariums: TDS meters help ensure that the water has the proper mineral levels for fish and other aquatic organisms.
Hydroponics: In hydroponic systems, where plants are grown in a nutrient solution without soil, TDS meters are used to monitor nutrient levels in the solution.
Swimming pools and spas: TDS meters can be used to monitor water quality and ensure that the water is safe and comfortable.
Interpretation of TDS values
0-50 ppm: Very low TDS content, typical of very pure water like distilled water.
50-150 ppm: Low TDS content, common in filtered water.
150-500 ppm: Moderate TDS content, often found in natural spring water.
500-1000 ppm: High TDS content, which may indicate that the water contains many minerals, which is not necessarily bad but should be checked.
1000+ ppm: Very high TDS content, which may indicate contaminated water and should be further investigated.
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