What tools are used to test for residual chlorine after disinfection?

Residual chlorine strips are specifically designed to measure the concentration of residual chlorine in water after disinfection processes. The strips utilize a colorimetric method, where the presence of chlorine causes a change in color that corresponds to its concentration level. This process is crucial for ensuring that disinfection was effective and that the water is safe for consumption.

pH meters are utilized to measure the acidity or alkalinity of water but do not provide information about chlorine levels. Hardness test strips are designed to assess the concentration of calcium and magnesium in water, which is unrelated to disinfection efficacy. Nutrient agar plates are used primarily for microbial culture and are not applicable for testing chemical residues such as chlorine in water.

Thus, the use of residual chlorine strips is the appropriate tool for assessing the effectiveness of chlorine disinfection in water systems.