RO plant parameters are the water quality factors that are measured to check the performance and efficiency of the RO system. Important parameters include TDS (Total Dissolved Solids), which shows the amount of dissolved salts in water; pH, which indicates the acidity or alkalinity of water; hardness, caused by calcium and magnesium; turbidity, which shows the presence of suspended particles; iron content, which can cause staining and membrane fouling; and chlorine, which can damage the RO membrane. Other operational parameters include pressure, flow rate, recovery rate, and rejection rate, which help monitor how effectively the RO plant is removing impurities and producing purified water.