1. Halogen donors such as liquid sodium hypochlorite solutions should be used. Note that chlorine-based halogen
donors are generally better for overcoming a high organic demand while being more cost effective than other
halogen donors. Stabilized bromine donors should not be used because they can become over-stabilized, and
thus ineffective, when fed at high levels.
2. Ensure sufficient liquid sodium hypochlorite solution is on-hand to completely perform the procedure.
3. Ideally, if the pH of the system is higher than 8.4 it should be reduced to 8.4) reduce
the effectiveness of chlorine-based halogens. It may be possible to reduce the pH by heavily pre-bleeding the
system.
4. Free chlorine levels should be measured and recorded every hour.
5. When testing for free chlorine, dilutions using chlorine-free deionized (DI) water may be required.