Granger‑Hunter shows nozzle selection, hose disinfection during sewer‑cleaning demonstration

Granger‑Hunter Improvement District operators demonstrated sewer‑cleaning techniques and equipment at a public “sewer summit” field demonstration, focusing on choosing nozzles for different pipe sizes, managing recurring trouble spots and a hose‑disinfection system mounted on cleaning trucks.

The demonstration matter-of-factly addressed why crews change nozzles and adjust flow rates: smaller nozzles and lower spray angles help pull hose and fight uphill flow, while larger “floor cleaner” nozzles and specialty cutters are used for large‑diameter pipes, grease and root removal. Presenters also showed a disinfectant‑injection device they said has been mounted on their trucks for about a year to spray hoses as they are pulled back from manholes.

The demonstration was presented by Granger‑Hunter operators identified during the session as Bruce (senior operator), Dave (CCTV foreman), Jimmy (operator/presenter) and Diedrich (operator who started a truck). Organizers said the session was intended for operators and municipal staff and included live truck demonstrations so remote attendees could view nozzle behavior and hose handling.

Why it…