🔬💦Total Dissolved Solids (TDS) and hardness are both water quality parameters, but they measure different aspects of water composition. 1️⃣ Total Dissolved Solids (TDS): Definition: TDS refers to the total amount of inorganic and organic substances dissolved in water, including minerals, salts, metals, and other substances. Measurement: TDS is measured in parts per million (ppm) or milligrams per litre (mg/L) and is typically determined using a conductivity meter or by evaporating a water samp