In the daily chemical industry, common water treatment agents include:

1. Coagulants: Such as alum (aluminum sulfate) and ferric chloride, used to remove suspended particles from water.

2. Flocculants: Such as polyacrylamides, which help form flocs by binding particles together for easier removal.

3. Disinfectants: Including chlorine, chlorine dioxide, and ozone, used to kill microorganisms and ensure water safety.

4. Biocides: Such as isothiazolinones and quaternary ammonium compounds, used to control microbial growth in various products.

5. Antiscalants: Like polyacrylic acids and phosphonates, which prevent scale formation in water systems.

6. pH Adjusters: Such as sulfuric acid or sodium hydroxide, used to maintain optimal pH levels in water treatment processes.

These agents help ensure water quality and system efficiency in the production of daily chemical products.