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TDS Formula:
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The TDS (Total Dissolved Solids) calculation estimates the concentration of dissolved substances in water based on electrical conductivity measurements. It provides a quick and practical way to assess water quality.
The calculator uses the TDS formula:
Where:
Explanation: The conversion factor k accounts for the relationship between electrical conductivity and dissolved solids concentration, which varies based on the ionic composition of the water.
Details: TDS measurement is important for assessing water quality in drinking water, aquariums, hydroponics, and various industrial processes. High TDS levels can indicate contamination or affect taste.
Tips: Enter electrical conductivity in μS/cm and select an appropriate conversion factor (typically 0.65 for most natural waters). All values must be valid (EC > 0, k between 0.5-0.8).
Q1: What is a typical conversion factor value?
A: For most natural waters, a conversion factor of 0.65 is commonly used, though it can range from 0.5 to 0.8 depending on the ionic composition.
Q2: What are typical TDS levels for drinking water?
A: Excellent: <300 ppm, Good: 300-600 ppm, Fair: 600-900 ppm, Poor: 900-1200 ppm, Unacceptable: >1200 ppm.
Q3: How does temperature affect the measurement?
A: Electrical conductivity increases with temperature. Most modern meters automatically compensate for temperature (usually to 25°C).
Q4: Are there limitations to this calculation?
A: The calculation provides an estimate. For precise measurements, laboratory analysis through evaporation and weighing is required.
Q5: Can I use this for seawater measurement?
A: The calculation is less accurate for seawater due to its different ionic composition. Specialized meters and calculations are recommended for seawater.