• The charge for waste water treatment through SPI recommends separating the meter's water supply to the plant and employee activities. In order to check the quantity of water use and wastewater in the employees ' activities.
• Charges wastewater treatment SPI to separate water supply that is paid to the factory and employees. In order to determine the amount of water used and wastewater activities on the part of employees.
- to charge the SPI purification suggest separate meter water supplied to the factory and staff activities. For use in monitoring water and wastewater in the staff activities.