How must the chemical enter the water flow for effective chemical injection?

For effective chemical injection, it is essential for the chemical to enter the water flow from the bottom. When chemicals are injected from the bottom of the tank, they have the best opportunity to mix thoroughly with the water. This method allows for proper dispersion and ensures that the chemical is effectively distributed throughout the water supply.

Injecting from the bottom takes advantage of the natural flow of water, allowing the chemical to rise and mix with the water rather than simply floating on the surface or remaining localized. This method also helps avoid issues like stratification, where the reactive properties of the chemicals are not adequately utilized.

In contrast, if chemicals were introduced from the top or from the side, there could be insufficient mixing, which may lead to uneven concentrations or reduced effectiveness of the treatment process. Additionally, free flow without proper injection points could result in uncontrolled chemical distribution and potential harm to the system or end-users.