Product Information Product Name : Aqua-Flo AF500Manufacturer: Enviro-Flo, Inc.Original Certification Date: 04/01/2019Certification Date: 04/01/2019Certification End Date: 04/01/2026Capacity: 500Material: ConcreteType: Aerobic Treatment SystemClass: Class 1 Certifications Certification: Certifications: NSF/ANSI Standard 40 Standard year: 2019 Version Year of Original Standard: 2013SPE#: 290 Approved Approved Aerators: Manufacturer: HiblowModel: HiBlow HP40Hi Blow model: HP-40 Approved Diffusers: Manufacturer: HiblowModel: 50SN000020 Approved Alarms: Manufacturer: Included on Aerator