Product Information Product Name : D-500-MManufacturer: Aeris AerobicsOriginal Certification Date: 05/12/2015Certification Date: 05/12/2015Certification End Date: 05/12/2022Capacity: 500Material: ConcreteType: Aerobic Treatment SystemClass: Class 1 Certifications Certification: Certifications: NSF/ANSI Standard 40 Standard year: 2019 Version Year of Original Standard: 2013SPE#: 243 Approved Approved Aerators: Manufacturer: HiblowHi Blow model: HP-40 Approved Diffusers: Manufacturer: HiblowModel: TP-250 Polypropylene