Always inject chemicals on the discharge side of a pump. Attached chemical feed pumps to a heavy object and rigid surfaces to prevent vibration. Mounted the chemical feed pump above the floor. The area must have adequate heat, light and ventilation. Install unions to facilitate repairs and replacement on the chemical feed tubing.
Duplication is optional for non acute treatment such as corrosion control.
The discharge line from a chemical feed pump requires an anti-siphon valve. Mineral deposits often occur at the injection point on the water main when feeding chemicals. The injection nozzle should be easy to disassemble so as to allow periodic cleaning. This flushing system would be manually activated. Develop a formal maintenance schedule for all chemicals.