Why does the Vortex Flow InsertTM assembly in a drop structure require no maintenance? Why is air treatment around the drop structure not necessary? How is H2S oxidized by the Vortex Flow method? Can the Vortex Flow method be used in drop structures requiring periodic access to the lower lines? I'm concerned about blockage or plugging of the Vortex Flow InsertTM assembly resulting in backup. Is there a solution to avoid such events? How are drops with lateral influent line(s) below the upper interceptor affected by installation of the Vortex Flow InsertTM assembly? Are there limits to the height of drop for which the Vortex Flow method is effective? Can a Vortex Flow InsertTM assembly be installed without flow bypassing? How can the Vortex Flow method reduce the operating costs of wastewater treatment plants (WWTP)? Can the Vortex Flow InsertTM assembly be used in a drop structure having an effluent line invert at the very bottom of the structure?     Why does the Vortex Flow InsertTM in a drop structure require no maintenance? (1) Intensive flow energy dissipation in the pool at the bottom of the structure provides a natural self-cleaning action. Heavy solids can't settle because of the turbulence in the pool, and are carried away with the effluent flow. (2) There is no need to rehabilitate the structure after installation of the Vortex Insert Assembly. Corrosive substances are neutralized, and there is inherently no abrasion. Why is air treatment around the drop structure not necessary? The surrounding air is actually pulled into the wastewater flow. There are simply no emissions of odorous gasses to treat. How is H2S oxidized by the Vortex Flow method? The Vortex Flow InsertTM assembly forces air into the wastewater by using the falling flow's energy. This process of aeration delivers oxygen to bond with the dissolved sulfides. Also, the process converts the H2S into dissolved H2SO4 that remains dissolved in low concentrations. Without in-flow oxidation, H2S molecules can become airborne and condense on pipe ceilings and infrastructure as highly concentrated acid. Can the Vortex Flow method be used in drop structures requiring periodic access to the lower lines? The Vortex Flow Insert TM assembly is designed to be removed if necessary, and later re-inserted. Alternatively, an installation can be designed to provide access to the MH without having to remove the Vortex Flow Insert TMassembly. I'm concerned about blockage or plugging of the Vortex Flow Insert assembly resulting in backup. Is there a solution to avoid such events? Yes, the Vortex Form typically includes a vent that will provide a flow bypass of the Vortex Shaft when the flow level rises above Vortex Form. This will prevent any flow backup in the conveyance system. How are drops with lateral influent line(s) below the upper interceptor affected by installation of the Vortex Flow InsertTMassembly? The lower lateral has no adverse impact on functionality. The falling flow from such lines conforms around the Vortex Shaft and runs down along its outer wall with substantially less turbulence. In addition, it runs down into the energy dissipating pool that is saturated with oxygen. Are there limits to the height of drop for which the Vortex Flow method is effective? We can determine the drop height at which point the air core will collapse at a given flow rate. Even in such cases, however, a negative air pressure remains above the vortex form, and all desired functionality and benefits are maintained. In general, optimal functionality will be realizable in drops exceeding 100 feet.   Can a Vortex Flow InsertTM assembly be installed without flow bypassing? It is possible to make the installation without bypassing, depending on the geometry of the existing drop and influent flow rate.       How can the Vortex Flow method reduce the operating costs of wastewater treatment plants (WWTP)? Locating drop structures employing Vortex Flow InsertTM assemblies immediately upstream of WWTP saves chemicals and oxygen used for treatment. Can the Vortex Flow InsertTM assembly be used in a drop structure having an effluent line invert at the very bottom of the structure? Yes. For such installations, the Vortex Flow Insert TM assembly can be fabricated with the energy dissipating pool vessel as part of the assembly.