What type of nozzle is typically used for bottom placement or deep-water injection?

The use of small holes drilled into a galvanized pipe is appropriate for bottom placement or deep-water injection because this method allows for the targeted application of materials directly to the water source or substrate. This approach is beneficial when attempting to manage aquatic pests in deeper water settings, as it ensures that the treatment reaches the desired depth without dispersing the product over a wider area, which could lead to reduced effectiveness.

The other nozzle types typically focus on surface applications or creating specific spray patterns that don't align with the objectives of deep-water treatment. Flat fan nozzles and full cone nozzles are designed for broadcasting products across a wider surface area, which is useful for surface applications rather than deep-water injections. Hollow cone nozzles, while capable of producing a spray suitable for certain applications, still do not target bottom placement as effectively as a pipe with drilled holes, which maintains the precision needed for deep-water scenarios.