When using a direct metering method, where does the water treatment take place?

The direct metering method refers to the application of treatment materials directly into the body of water, such as lakes, ponds, or reservoirs, where they are intended to take effect. This method is often employed for aquatic pest control because it allows for immediate and targeted treatment of pest species.

By applying chemicals or biological controls directly into the water, the treatment can quickly reach the target organisms, ensuring efficacy in addressing pest populations. This approach can be more efficient and effective for large bodies of water compared to alternatives that require transportation or storage of treated water.

In contrast, options such as treating at a facility or using spray tanks imply a detachment from the water body, which can limit the impact and immediacy of the treatment. Similarly, filtration systems focus on clarifying or filtering the water rather than applying treatments. Therefore, the correct choice emphasizes the importance of direct application in the desired location where treatment is needed.